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<!doctype html><html lang=en itemscope itemtype=https://schema.org/WebPage><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=theme-color content="#466BB0"><meta name=title content="Collecting Metrics for TCP services"><meta name=description content="This task shows you how to configure Istio to collect metrics for TCP services."><meta name=keywords content="microservices,services,mesh,telemetry,metrics,tcp"><meta property="og:title" content="Collecting Metrics for TCP services"><meta property="og:type" content="website"><meta property="og:description" content="This task shows you how to configure Istio to collect metrics for TCP services."><meta property="og:url" content="/v1.0/docs/tasks/telemetry/tcp-metrics/"><meta property="og:image" content="/v1.0/img/istio-logo-blue-background.svg"><meta property="og:image:alt" content="Istio Logo"><meta property="og:image:width" content="112"><meta property="og:image:height" content="150"><meta property="og:site_name" content="Istio"><meta name=twitter:card content="summary"><meta name=twitter:site content="@IstioMesh"><title>Istioldie 1.0 / Collecting Metrics for TCP services</title><script async src="https://www.googletagmanager.com/gtag/js?id=UA-98480406-2"></script><script>window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}
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Concepts</div></a></div><div id=collapse10 class=collapse data-parent=#sidebar role=tabpanel aria-labelledby=header10><div class=card-body><ul class=tree><li><a title="Introduces Istio, the problems it solves, its high-level architecture and design goals." href=/v1.0/docs/concepts/what-is-istio/>What is Istio?</a></li><li><a title="Describes the various Istio features focused on traffic routing and control." href=/v1.0/docs/concepts/traffic-management/>Traffic Management</a></li><li><a title="Describes Istio's authorization and authentication functionality." href=/v1.0/docs/concepts/security/>Security</a></li><li><a title="Describes the policy enforcement and telemetry mechanisms." href=/v1.0/docs/concepts/policies-and-telemetry/>Policies and Telemetry</a></li><li><a title="Introduces Performance and Scalability methodology, results and best practices for Istio components." href=/v1.0/docs/concepts/performance-and-scalability/>Performance and Scalability</a></li></ul></div></div></div><div class=card><div class=card-header role=tab id=header20><a data-toggle=collapse href=#collapse20 title="How to deploy Istio in various environments (e.g., Kubernetes, Consul)." role=button aria-controls=collapse20><div><img src=/v1.0/img/setup.svg alt=Icon class=page_icon>
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Setup</div></a></div><div id=collapse20 class=collapse data-parent=#sidebar role=tabpanel aria-labelledby=header20><div class=card-body><ul class=tree><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Instructions for installing the Istio control plane on Kubernetes and adding virtual machines into the mesh." href=/v1.0/docs/setup/kubernetes/>Kubernetes</a></label><ul class="tree collapse"><li><a title="Instructions to download the Istio release." href=/v1.0/docs/setup/kubernetes/download-release/>Downloading the Release</a></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="How to prepare various Kubernetes platforms before installing Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/>Platform Setup</a></label><ul class="tree collapse"><li><a title="Instructions to setup an Alibaba Cloud Kubernetes cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/alicloud/>Alibaba Cloud</a></li><li><a title="Instructions to setup an AWS cluster with Kops cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/aws/>Amazon Web Services</a></li><li><a title="Instructions to setup an Azure cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/azure/>Azure</a></li><li><a title="Instructions to setup a Google Kubernetes Engine cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/gke/>Google Kubernetes Engine</a></li><li><a title="Instructions to setup an IBM Cloud cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/ibm/>IBM Cloud</a></li><li><a title="Instructions to setup Minikube for use with Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/minikube/>Minikube</a></li><li><a title="Instructions to setup an OpenShift cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/openshift/>OpenShift</a></li><li><a title="Instructions to setup an OKE cluster for Istio." href=/v1.0/docs/setup/kubernetes/platform-setup/oci/>Oracle Cloud Infrastructure</a></li></ul></li><li><a title="Instructions to setup the Istio service mesh in a Kubernetes cluster." href=/v1.0/docs/setup/kubernetes/quick-start/>Quick Start with Kubernetes</a></li><li><a title="How to quickly setup Istio using Alibaba Cloud Kubernetes Container Service." href=/v1.0/docs/setup/kubernetes/quick-start-alicloud-ack/>Quick Start with Alibaba Cloud Kubernetes Container Service</a></li><li><a title="How to quickly setup Istio using IBM Cloud Public or IBM Cloud Private." href=/v1.0/docs/setup/kubernetes/quick-start-ibm/>Quick Start with IBM Cloud</a></li><li><a title="Install Istio with the included Helm chart." href=/v1.0/docs/setup/kubernetes/helm-install/>Installation with Helm</a></li><li><a title="Instructions for installing the Istio sidecar in application pods automatically using the sidecar injector webhook or manually using istioctl CLI." href=/v1.0/docs/setup/kubernetes/sidecar-injection/>Installing the sidecar</a></li><li><a title="Install minimal Istio using Helm." href=/v1.0/docs/setup/kubernetes/minimal-install/>Minimal Istio Installation</a></li><li><a title="Install Istio with the included Ansible playbook." href=/v1.0/docs/setup/kubernetes/ansible-install/>Installation with Ansible</a></li><li><a title="Instructions for integrating VMs and bare metal hosts into an Istio mesh deployed on Kubernetes." href=/v1.0/docs/setup/kubernetes/mesh-expansion/>Mesh Expansion</a></li><li><a title="Install Istio with multicluster support." href=/v1.0/docs/setup/kubernetes/multicluster-install/>Istio Multicluster</a></li><li><a title="How to quickly setup Istio using Google Kubernetes Engine (GKE)." href=/v1.0/docs/setup/kubernetes/quick-start-gke/>Quick Start with Google Kubernetes Engine</a></li><li><a title="Demonstrates how to upgrade the Istio control plane and data plane independently." href=/v1.0/docs/setup/kubernetes/upgrading-istio/>Upgrading Istio</a></li><li><a title="Describes the requirements for Kubernetes pods and services to run Istio." href=/v1.0/docs/setup/kubernetes/spec-requirements/>Requirements for Pods and Services</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Instructions for installing the Istio control plane in a Consul based environment, with or without Nomad." href=/v1.0/docs/setup/consul/>Nomad & Consul</a></label><ul class="tree collapse"><li><a title="Quick Start instructions to setup the Istio service mesh with Docker Compose." href=/v1.0/docs/setup/consul/quick-start/>Quick Start on Docker</a></li><li><a title="Instructions for installing the Istio control plane in a Consul-based environment, with or without Nomad." href=/v1.0/docs/setup/consul/install/>Installation</a></li></ul></li></ul></div></div></div><div class=card><div class=card-header role=tab id=header33><a data-toggle=collapse href=#collapse33 title="How to do single specific targeted activities with the Istio system." role=button aria-controls=collapse33><div><img src=/v1.0/img/tasks.svg alt=Icon class=page_icon>
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Tasks</div></a></div><div id=collapse33 class="collapse show" data-parent=#sidebar role=tabpanel aria-labelledby=header33><div class=card-body><ul class=tree><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Tasks that demonstrate Istio's traffic routing features." href=/v1.0/docs/tasks/traffic-management/>Traffic Management</a></label><ul class="tree collapse"><li><a title="This task shows you how to configure dynamic request routing to multiple versions of a microservice." href=/v1.0/docs/tasks/traffic-management/request-routing/>Configuring Request Routing</a></li><li><a title="This task shows you how to inject faults to test the resiliency of your application." href=/v1.0/docs/tasks/traffic-management/fault-injection/>Fault Injection</a></li><li><a title="Shows you how to migrate traffic from an old to new version of a service." href=/v1.0/docs/tasks/traffic-management/traffic-shifting/>Traffic Shifting</a></li><li><a title="This task shows you how to setup request timeouts in Envoy using Istio." href=/v1.0/docs/tasks/traffic-management/request-timeouts/>Setting Request Timeouts</a></li><li><a title="Describes how to configure Istio to expose a service outside of the service mesh." href=/v1.0/docs/tasks/traffic-management/ingress/>Control Ingress Traffic</a></li><li><a title="Describes how to configure Istio to expose a service outside of the service mesh, over TLS, mutual TLS or JWT authentication." href=/v1.0/docs/tasks/traffic-management/secure-ingress/>Securing Gateways with HTTPS</a></li><li><a title="Describes how to configure Istio to route traffic from services in the mesh to external services." href=/v1.0/docs/tasks/traffic-management/egress/>Control Egress Traffic</a></li><li><a title="This task shows you how to configure circuit breaking for connections, requests, and outlier detection." href=/v1.0/docs/tasks/traffic-management/circuit-breaking/>Circuit Breaking</a></li><li><a title="This task demonstrates the traffic mirroring/shadowing capabilities of Istio." href=/v1.0/docs/tasks/traffic-management/mirroring/>Mirroring</a></li><li><a title="Shows how to do health checking for Istio services." href=/v1.0/docs/tasks/traffic-management/app-health-check/>Health Checking of Istio Services</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Demonstrates how to secure the mesh." href=/v1.0/docs/tasks/security/>Security</a></label><ul class="tree collapse"><li><a title="Shows you how to use Istio authentication policy to setup mutual TLS and basic end-user authentication." href=/v1.0/docs/tasks/security/authn-policy/>Authentication Policy</a></li><li><a title="Shows you how to verify and test Istio's automatic mutual TLS authentication." href=/v1.0/docs/tasks/security/mutual-tls/>Mutual TLS Deep-Dive</a></li><li><a title="Shows how to set up role-based access control for services in the mesh." href=/v1.0/docs/tasks/security/role-based-access-control/>Authorization</a></li><li><a title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key." href=/v1.0/docs/tasks/security/plugin-ca-cert/>Plugging in external CA key and certificate</a></li><li><a title="Shows how to enable Citadel health checking with Kubernetes." href=/v1.0/docs/tasks/security/health-check/>Citadel health checking</a></li><li><a title="Shows you how to incrementally migrate your Istio services to mutual TLS." href=/v1.0/docs/tasks/security/mtls-migration/>Mutual TLS Migration</a></li><li><a title="Shows how to enable mutual TLS on HTTPS services." href=/v1.0/docs/tasks/security/https-overlay/>Mutual TLS over HTTPS</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Demonstrates policy enforcement features." href=/v1.0/docs/tasks/policy-enforcement/>Policies</a></label><ul class="tree collapse"><li><a title="This task shows you how to use Istio to dynamically limit the traffic to a service." href=/v1.0/docs/tasks/policy-enforcement/rate-limiting/>Enabling Rate Limits</a></li><li><a title="Shows how to control access to a service using simple denials or white/black listing." href=/v1.0/docs/tasks/policy-enforcement/denial-and-list/>Denials and White/Black Listing</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-down"></i><a title="Demonstrates how to collect telemetry information from the mesh." href=/v1.0/docs/tasks/telemetry/>Telemetry</a></label><ul class=tree><li><a title="How to configure the proxies to send tracing requests to Zipkin or Jaeger." href=/v1.0/docs/tasks/telemetry/distributed-tracing/>Distributed Tracing</a></li><li><a title="This task shows you how to configure Istio to collect metrics and logs." href=/v1.0/docs/tasks/telemetry/metrics-logs/>Collecting Metrics and Logs</a></li><li><span class=current title="This task shows you how to configure Istio to collect metrics for TCP services.">Collecting Metrics for TCP services</span></li><li><a title="This task shows you how to query for Istio Metrics using Prometheus." href=/v1.0/docs/tasks/telemetry/querying-metrics/>Querying Metrics from Prometheus</a></li><li><a title="This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic." href=/v1.0/docs/tasks/telemetry/using-istio-dashboard/>Visualizing Metrics with Grafana</a></li><li><a title="This task shows you how to visualize your services within an Istio mesh." href=/v1.0/docs/tasks/telemetry/kiali/>Visualizing Your Mesh</a></li><li><a title="This task shows you how to generate a graph of services within an Istio mesh." href=/v1.0/docs/tasks/telemetry/servicegraph/>Generating a Service Graph</a></li><li><a title="This task shows you how to configure Istio to log to a Fluentd daemon." href=/v1.0/docs/tasks/telemetry/fluentd/>Logging with Fluentd</a></li></ul></li></ul></div></div></div><div class=card><div class=card-header role=tab id=header46><a data-toggle=collapse href=#collapse46 title="A variety of fully working example uses for Istio that you can experiment with." role=button aria-controls=collapse46><div><img src=/v1.0/img/examples.svg alt=Icon class=page_icon>
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Examples</div></a></div><div id=collapse46 class=collapse data-parent=#sidebar role=tabpanel aria-labelledby=header46><div class=card-body><ul class=tree><li><a title="Deploys a sample application composed of four separate microservices used to demonstrate various Istio features." href=/v1.0/docs/examples/bookinfo/>Bookinfo Application</a></li><li><a title="Demonstrates how to use various traffic management capabilities of an Istio service mesh." href=/v1.0/docs/examples/intelligent-routing/>Intelligent Routing</a></li><li><a title="Demonstrates how to obtain uniform metrics, logs, traces across different services using Istio Mixer and Istio sidecar." href=/v1.0/docs/examples/telemetry/>In-Depth Telemetry</a></li><li><a title="Explains how to manually integrate Google Cloud Endpoints services with Istio." href=/v1.0/docs/examples/endpoints/>Install Istio for Google Cloud Endpoints Services</a></li><li><a title="Illustrates how to use Istio to control a Kubernetes cluster and raw VMs as a single mesh." href=/v1.0/docs/examples/integrating-vms/>Integrating Virtual Machines</a></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="A variety of fully working examples for egress traffic control in Istio that you can experiment with." href=/v1.0/docs/examples/advanced-egress/>Advanced egress traffic control</a></label><ul class="tree collapse"><li><a title="Describes how to configure Istio to perform TLS origination for traffic to external services." href=/v1.0/docs/examples/advanced-egress/egress-tls-origination/>TLS Origination for Egress Traffic</a></li><li><a title="Describes how to configure Istio to direct traffic to external services through a dedicated gateway." href=/v1.0/docs/examples/advanced-egress/egress-gateway/>Configure an Egress Gateway</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="A variety of fully working multicluster examples for Istio that you can experiment with." href=/v1.0/docs/examples/multicluster/>Enabling multiclusters</a></label><ul class="tree collapse"><li><a title="Example multicluster GKE install of Istio." href=/v1.0/docs/examples/multicluster/gke/>Google Kubernetes Engine</a></li><li><a title="Example multicluster IBM Cloud Private install of Istio." href=/v1.0/docs/examples/multicluster/icp/>IBM Cloud Private</a></li><li><a title="Example multicluster between IBM Cloud Kubernetes Service & IBM Cloud Private." href=/v1.0/docs/examples/multicluster/iks-icp/>IBM Cloud Kubernetes Service & IBM Cloud Private</a></li></ul></li></ul></div></div></div><div class=card><div class=card-header role=tab id=header78><a data-toggle=collapse href=#collapse78 title="Detailed authoritative reference material such as command-line options, configuration options, and API calling parameters." role=button aria-controls=collapse78><div><img src=/v1.0/img/reference.svg alt=Icon class=page_icon>
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Reference</div></a></div><div id=collapse78 class=collapse data-parent=#sidebar role=tabpanel aria-labelledby=header78><div class=card-body><ul class=tree><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Detailed information on configuration options." href=/v1.0/docs/reference/config/>Configuration</a></label><ul class="tree collapse"><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Describes how to configure Istio's authorization features." href=/v1.0/docs/reference/config/authorization/>Authorization</a></label><ul class="tree collapse"><li><a title="Describes the supported constraints and properties." href=/v1.0/docs/reference/config/authorization/constraints-and-properties/>Constraints and Properties</a></li><li><a title="Configuration for Role Based Access Control." href=/v1.0/docs/reference/config/authorization/istio.rbac.v1alpha1/>RBAC</a></li></ul></li><li><a title="Describes the options available when installing Istio using the included Helm chart." href=/v1.0/docs/reference/config/installation-options/>Installation Options</a></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Describes how to configure Istio's policy and telemetry features." href=/v1.0/docs/reference/config/policy-and-telemetry/>Policies and Telemetry</a></label><ul class="tree collapse"><li><a title="Describes the base attribute vocabulary used for policy and control." href=/v1.0/docs/reference/config/policy-and-telemetry/attribute-vocabulary/>Attribute Vocabulary</a></li><li><a title="Mixer configuration expression language reference." href=/v1.0/docs/reference/config/policy-and-telemetry/expression-language/>Expression Language</a></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Mixer adapters allow Istio to interface to a variety of infrastructure backends for such things as metrics and logs." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/>Adapters</a></label><ul class="tree collapse"><li><a title="Adapter for Apigee's distributed policy checks and analytics." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/apigee/>Apigee</a></li><li><a title="Adapter for circonus.com's monitoring solution." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/circonus/>Circonus</a></li><li><a title="Adapter for cloudwatch metrics." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/cloudwatch/>CloudWatch</a></li><li><a title="Adapter to deliver metrics to a dogstatsd agent for delivery to DataDog." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/datadog/>Datadog</a></li><li><a title="Adapter that always returns a precondition denial." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/denier/>Denier</a></li><li><a title="Adapter that delivers logs to a fluentd daemon." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/fluentd/>Fluentd</a></li><li><a title="Adapter that extracts information from a Kubernetes environment." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/kubernetesenv/>Kubernetes Env</a></li><li><a title="Adapter that performs whitelist or blacklist checks." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/list/>List</a></li><li><a title="Adapter for a simple in-memory quota management system." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/memquota/>Memory quota</a></li><li><a title="Adapter that implements an Open Policy Agent engine." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/opa/>OPA</a></li><li><a title="Adapter that exposes Istio metrics for ingestion by a Prometheus harvester." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/prometheus/>Prometheus</a></li><li><a title="Adapter that exposes Istio's Role-Based Access Control model." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/rbac/>RBAC</a></li><li><a title="Adapter for a Redis-based quota management system." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/redisquota/>Redis Quota</a></li><li><a title="Adapter that delivers logs and metrics to Google Service Control." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/servicecontrol/>Service Control</a></li><li><a title="Adapter that sends Istio metrics to SignalFx." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/signalfx/>SignalFx</a></li><li><a title="Adapter to deliver logs and metrics to Papertrail and AppOptics backends." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/solarwinds/>SolarWinds</a></li><li><a title="Adapter to deliver logs, metrics, and traces to Stackdriver." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/stackdriver/>Stackdriver</a></li><li><a title="Adapter to deliver metrics to a StatsD backend." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/statsd/>StatsD</a></li><li><a title="Adapter for outputting logs and metrics locally." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/stdio/>Stdio</a></li><li><a title="Adapter to deliver metrics to Wavefront by VMware." href=/v1.0/docs/reference/config/policy-and-telemetry/adapters/wavefront/>Wavefront by VMware</a></li></ul></li><li><a title="Default Metrics exported from Istio through Mixer." href=/v1.0/docs/reference/config/policy-and-telemetry/metrics/>Default Metrics</a></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Mixer templates are used to send data to individual adapters." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/>Templates</a></label><ul class="tree collapse"><li><a title="The Analytics template is used to dispatch runtime telemetry to Apigee." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/analytics/>Analytics</a></li><li><a title="A template that represents a single API key." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/apikey/>API Key</a></li><li><a title="A template used to represent an access control query." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/authorization/>Authorization</a></li><li><a title="A template that carries no data, useful for testing." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/checknothing/>Check Nothing</a></li><li><a title="A template that is used to control the production of Kubernetes-specific attributes." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/kubernetes/>Kubernetes</a></li><li><a title="A template designed to let you perform list checking operations." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/listentry/>List Entry</a></li><li><a title="A template that represents a single runtime log entry." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/logentry/>Log Entry</a></li><li><a title="A template that represents a single runtime metric." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/metric/>Metric</a></li><li><a title="A template that represents a quota allocation request." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/quota/>Quota</a></li><li><a title="A template that carries no data, useful for testing." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/reportnothing/>Report Nothing</a></li><li><a title="A template used by the Google Service Control adapter." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/servicecontrolreport/>Service Control Report</a></li><li><a title="A template that represents\ an individual span within a distributed trace." href=/v1.0/docs/reference/config/policy-and-telemetry/templates/tracespan/>Trace Span</a></li></ul></li><li><a title="Describes the rules used to configure Mixer's policy and telemetry features." href=/v1.0/docs/reference/config/policy-and-telemetry/istio.policy.v1beta1/>Rules</a></li></ul></li><li><a title="Authentication policy for Istio services." href=/v1.0/docs/reference/config/istio.authentication.v1alpha1/>Authentication Policy</a></li><li><a title="Configuration affecting traffic routing." href=/v1.0/docs/reference/config/istio.networking.v1alpha3/>Traffic Routing</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Describes usage and options of the Istio commands and utilities." href=/v1.0/docs/reference/commands/>Commands</a></label><ul class="tree collapse"><li><a title="Galley provides configuration management services for Istio." href=/v1.0/docs/reference/commands/galley/>galley</a></li><li><a title="Istio Certificate Authority (CA)." href=/v1.0/docs/reference/commands/istio_ca/>istio_ca</a></li><li><a title="Istio control interface." href=/v1.0/docs/reference/commands/istioctl/>istioctl</a></li><li><a title="Utility to trigger direct calls to Mixer's API." href=/v1.0/docs/reference/commands/mixc/>mixc</a></li><li><a title="Mixer is Istio's abstraction on top of infrastructure backends." href=/v1.0/docs/reference/commands/mixs/>mixs</a></li><li><a title="Istio security per-node agent." href=/v1.0/docs/reference/commands/node_agent/>node_agent</a></li><li><a title="Istio Pilot agent." href=/v1.0/docs/reference/commands/pilot-agent/>pilot-agent</a></li><li><a title="Istio Pilot." href=/v1.0/docs/reference/commands/pilot-discovery/>pilot-discovery</a></li><li><a title="Kubernetes webhook for automatic Istio sidecar injection." href=/v1.0/docs/reference/commands/sidecar-injector/>sidecar-injector</a></li></ul></li></ul></div></div></div></div></nav></div><div class="col-12 col-md-9 col-xl-8"><p class=d-md-none><label class=sidebar-toggler data-toggle=offcanvas><i class="fa fa-sign-out-alt"></i></label></p><main aria-labelledby=title><div class=pagenav><p><a href=/v1.0/docs/tasks/telemetry/ title="Demonstrates how to collect telemetry information from the mesh."><i style=transform:scaleX(-1) class="fa fa-level-up-alt"></i> Telemetry</a></p></div><h1 id=title>Collecting Metrics for TCP services</h1><nav class="toc-inlined d-xl-none d-print-none"><hr><div class=directory role=directory><nav id=InlinedTableOfContents><ul><li><a href=#before-you-begin>Before you begin</a></li><li><a href=#collecting-new-telemetry-data>Collecting new telemetry data</a></li><li><a href=#understanding-tcp-telemetry-collection>Understanding TCP telemetry collection</a></li><ul><li><a href=#tcp-attributes>TCP attributes</a></li></ul><li><a href=#cleanup>Cleanup</a></li><li><a href=#see-also>See also</a></li></ul></nav></div><hr></nav><p>This task shows how to configure Istio to automatically gather telemetry for TCP
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services in a mesh. At the end of this task, a new metric will be enabled for
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calls to a TCP service within your mesh.</p><p>The <a href=/v1.0/docs/examples/bookinfo/>Bookinfo</a> sample application is used
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as the example application throughout this task.</p><h2 id=before-you-begin>Before you begin</h2><ul><li><p><a href=/v1.0/docs/setup/>Install Istio</a> in your cluster and deploy an
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application.</p></li><li><p>This task assumes that the Bookinfo sample will be deployed in the <code>default</code>
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namespace. If you use a different namespace, you will need to update the
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example configuration and commands.</p></li></ul><h2 id=collecting-new-telemetry-data>Collecting new telemetry data</h2><ol><li><p>Create a new YAML file to hold configuration for the new metrics that Istio
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will generate and collect automatically.</p><p>Save the following as <code>tcp_telemetry.yaml</code>:</p><pre><code class=language-yaml># Configuration for a metric measuring bytes sent from a server
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# to a client
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apiVersion: "config.istio.io/v1alpha2"
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kind: metric
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metadata:
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name: mongosentbytes
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namespace: default
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spec:
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value: connection.sent.bytes | 0 # uses a TCP-specific attribute
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dimensions:
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source_service: source.workload.name | "unknown"
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source_version: source.labels["version"] | "unknown"
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destination_version: destination.labels["version"] | "unknown"
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monitoredResourceType: '"UNSPECIFIED"'
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---
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# Configuration for a metric measuring bytes sent from a client
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# to a server
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apiVersion: "config.istio.io/v1alpha2"
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kind: metric
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metadata:
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name: mongoreceivedbytes
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namespace: default
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spec:
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value: connection.received.bytes | 0 # uses a TCP-specific attribute
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dimensions:
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source_service: source.workload.name | "unknown"
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source_version: source.labels["version"] | "unknown"
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destination_version: destination.labels["version"] | "unknown"
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monitoredResourceType: '"UNSPECIFIED"'
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---
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# Configuration for a Prometheus handler
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apiVersion: "config.istio.io/v1alpha2"
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kind: prometheus
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metadata:
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name: mongohandler
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namespace: default
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spec:
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metrics:
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- name: mongo_sent_bytes # Prometheus metric name
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instance_name: mongosentbytes.metric.default # Mixer instance name (fully-qualified)
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kind: COUNTER
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label_names:
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- source_service
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- source_version
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- destination_version
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- name: mongo_received_bytes # Prometheus metric name
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instance_name: mongoreceivedbytes.metric.default # Mixer instance name (fully-qualified)
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kind: COUNTER
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label_names:
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- source_service
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- source_version
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- destination_version
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---
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# Rule to send metric instances to a Prometheus handler
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apiVersion: "config.istio.io/v1alpha2"
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kind: rule
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metadata:
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name: mongoprom
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namespace: default
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spec:
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match: context.protocol == "tcp"
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&& destination.service == "mongodb.default.svc.cluster.local"
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actions:
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- handler: mongohandler.prometheus
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instances:
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- mongoreceivedbytes.metric
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- mongosentbytes.metric</code></pre></li><li><p>Push the new configuration.</p><pre><code class=language-command>$ kubectl apply -f tcp_telemetry.yaml
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Created config metric/default/mongosentbytes at revision 3852843
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Created config metric/default/mongoreceivedbytes at revision 3852844
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Created config prometheus/default/mongohandler at revision 3852845
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Created config rule/default/mongoprom at revision 3852846</code></pre></li><li><p>Setup Bookinfo to use MongoDB.</p><ol><li><p>Install <code>v2</code> of the <code>ratings</code> service.</p><p>If you are using a cluster with automatic sidecar injection enabled,
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simply deploy the services using <code>kubectl</code>:</p><pre><code class=language-command>$ kubectl apply -f @samples/bookinfo/platform/kube/bookinfo-ratings-v2.yaml@</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/platform/kube/bookinfo-ratings-v2.yaml></a><p>If you are using manual sidecar injection, use the following command instead:</p><pre><code class=language-command>$ kubectl apply -f <(istioctl kube-inject -f @samples/bookinfo/platform/kube/bookinfo-ratings-v2.yaml@)
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deployment "ratings-v2" configured</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/platform/kube/bookinfo-ratings-v2.yaml></a></li><li><p>Install the <code>mongodb</code> service:</p><p>If you are using a cluster with automatic sidecar injection enabled,
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simply deploy the services using <code>kubectl</code>:</p><pre><code class=language-command>$ kubectl apply -f @samples/bookinfo/platform/kube/bookinfo-db.yaml@</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/platform/kube/bookinfo-db.yaml></a><p>If you are using manual sidecar injection, use the following command instead:</p><pre><code class=language-command>$ kubectl apply -f <(istioctl kube-inject -f @samples/bookinfo/platform/kube/bookinfo-db.yaml@)
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service "mongodb" configured
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deployment "mongodb-v1" configured</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/platform/kube/bookinfo-db.yaml></a></li><li><p>The Bookinfo sample deploys multiple versions of each microservice, so you will start by creating destination rules
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that define the service subsets corresponding to each version, and the load balancing policy for each subset.</p><pre><code class=language-command>$ kubectl apply -f @samples/bookinfo/networking/destination-rule-all.yaml@</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/networking/destination-rule-all.yaml></a><p>If you enabled mutual TLS, please run the following instead</p><pre><code class=language-command>$ kubectl apply -f @samples/bookinfo/networking/destination-rule-all-mtls.yaml@</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/networking/destination-rule-all-mtls.yaml></a><p>You can display the destination rules with the following command:</p><pre><code class=language-command>$ kubectl get destinationrules -o yaml</code></pre><p>Since the subset references in virtual services rely on the destination rules,
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wait a few seconds for destination rules to propagate before adding virtual services that refer to these subsets.</p></li><li><p>Create <code>ratings</code> and <code>reviews</code> virtual services:</p><pre><code class=language-command>$ kubectl apply -f @samples/bookinfo/networking/virtual-service-ratings-db.yaml@
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Created config virtual-service/default/reviews at revision 3003
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Created config virtual-service/default/ratings at revision 3004</code></pre><a hidden style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/networking/virtual-service-ratings-db.yaml></a></li></ol></li><li><p>Send traffic to the sample application.</p><p>For the Bookinfo sample, visit <code>http://$GATEWAY_URL/productpage</code> in your web
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browser or issue the following command:</p><pre><code class=language-command>$ curl http://$GATEWAY_URL/productpage</code></pre></li><li><p>Verify that the new metric values are being generated and collected.</p><p>In a Kubernetes environment, setup port-forwarding for Prometheus by
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executing the following command:</p><pre><code class=language-command>$ kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=prometheus -o jsonpath='{.items[0].metadata.name}') 9090:9090 &</code></pre><p>View values for the new metric via the <a href=http://localhost:9090/graph#%5B%7B%22range_input%22%3A%221h%22%2C%22expr%22%3A%22istio_mongo_received_bytes%22%2C%22tab%22%3A1%7D%5D>Prometheus UI</a>.</p><p>The provided link opens the Prometheus UI and executes a query for values of
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the <code>istio_mongo_received_bytes</code> metric. The table displayed in the
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<strong>Console</strong> tab includes entries similar to:</p><pre><code class=language-plain>istio_mongo_received_bytes{destination_version="v1",instance="172.17.0.18:42422",job="istio-mesh",source_service="ratings-v2",source_version="v2"} 2317</code></pre><blockquote><p>Istio also collects protocol-specific statistics for MongoDB. For
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example, the value of total OP_QUERY messages sent from the <code>ratings</code> service
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is collected in the following metric:
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<code>envoy_mongo_outbound_27017__mongodb_default_svc_cluster_local_collection_ratings_query_total</code>
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(click <a href=http://localhost:9090/graph#%5B%7B%22range_input%22%3A%221h%22%2C%22expr%22%3A%22envoy_mongo_outbound_27017__mongodb_default_svc_cluster_local_collection_ratings_query_total%22%2C%22tab%22%3A1%7D%5D>here</a>
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to execute the query).</p></blockquote></li></ol><h2 id=understanding-tcp-telemetry-collection>Understanding TCP telemetry collection</h2><p>In this task, you added Istio configuration that instructed Mixer to
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automatically generate and report a new metric for all traffic to a TCP service
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within the mesh.</p><p>Similar to the <a href=/v1.0/docs/tasks/telemetry/metrics-logs/>Collecting Metrics and
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Logs</a> Task, the new
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configuration consisted of <em>instances</em>, a <em>handler</em>, and a <em>rule</em>. Please see
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that Task for a complete description of the components of metric collection.</p><p>Metrics collection for TCP services differs only in the limited set of
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attributes that are available for use in <em>instances</em>.</p><h3 id=tcp-attributes>TCP attributes</h3><p>Several TCP-specific attributes enable TCP policy and control within Istio.
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These attributes are generated by server-side Envoy proxies. They are forwarded to Mixer at connection establishment, and forwarded periodically when connection is alive (periodical report), and forwarded at connection close (final report). The default interval for periodical report is 10 seconds, and it should be at least 1 second. Additionally, context attributes provide the ability to distinguish between <code>http</code> and <code>tcp</code>
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protocols within policies.</p><figure style=width:100%><div class=wrapper-with-intrinsic-ratio style=padding-bottom:192.5%><a class=not-for-endnotes href=/v1.0/docs/tasks/telemetry/tcp-metrics/./istio-tcp-attribute-flow.svg><img class=element-to-stretch src=/v1.0/docs/tasks/telemetry/tcp-metrics/./istio-tcp-attribute-flow.svg alt="Attribute Generation Flow for TCP Services in an Istio Mesh." title="TCP Attribute Flow"></a></div><figcaption>TCP Attribute Flow</figcaption></figure><h2 id=cleanup>Cleanup</h2><ul><li><p>Remove the new telemetry configuration:</p><pre><code class=language-command>$ kubectl delete -f tcp_telemetry.yaml</code></pre></li><li><p>Remove the <code>port-forward</code> process:</p><pre><code class=language-command>$ killall kubectl</code></pre></li><li><p>If you are not planning to explore any follow-on tasks, refer to the
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<a href=/v1.0/docs/examples/bookinfo/#cleanup>Bookinfo cleanup</a> instructions
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to shutdown the application.</p></li></ul><h2 id=see-also>See also</h2><div class=see-also><div class=container-fluid><div class=row><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/docs/tasks/telemetry/metrics-logs/>Collecting Metrics and Logs</a></p><p class=desc>This task shows you how to configure Istio to collect metrics and logs.</p></div><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/docs/examples/telemetry/>In-Depth Telemetry</a></p><p class=desc>Demonstrates how to obtain uniform metrics, logs, traces across different services using Istio Mixer and Istio sidecar.</p></div><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/docs/tasks/telemetry/querying-metrics/>Querying Metrics from Prometheus</a></p><p class=desc>This task shows you how to query for Istio Metrics using Prometheus.</p></div><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/blog/2018/egress-tcp/>Consuming External TCP Services</a></p><p class=desc>Describes a simple scenario based on Istio's Bookinfo example.</p></div><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/blog/2017/mixer-spof-myth/>Mixer and the SPOF Myth</a></p><p class=desc>Improving availability and reducing latency.</p></div><div class="col-xs-12 col-sm-6 col-xl-4"><p class=link><a href=/v1.0/blog/2017/adapter-model/>Mixer Adapter Model</a></p><p class=desc>Provides an overview of Mixer's plug-in architecture.</p></div></div></div></div></main><div class="container-fluid d-print-none"><br><div class=row><div class="col-6 pagenav"><p><a title="This task shows you how to configure Istio to collect metrics and logs." href=/v1.0/docs/tasks/telemetry/metrics-logs/><i class="fa fa-long-arrow-alt-left"></i>Collecting Metrics and Logs</a></p></div><div class="col-6 pagenav" style=text-align:right><p><a title="This task shows you how to query for Istio Metrics using Prometheus." href=/v1.0/docs/tasks/telemetry/querying-metrics/>Querying Metrics from Prometheus
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<i class="fa fa-long-arrow-alt-right"></i></a></p></div></div></div><div class="d-none d-print-block" aria-hidden=true><h2>Links</h2><ol id=endnotes></ol></div></div><div class="col-12 col-md-2 d-none d-xl-block d-print-none"><nav class=toc><div class=spacer></div><div id=toc class=directory role=directory><nav id=TableOfContents><ul><li><a href=#before-you-begin>Before you begin</a></li><li><a href=#collecting-new-telemetry-data>Collecting new telemetry data</a></li><li><a href=#understanding-tcp-telemetry-collection>Understanding TCP telemetry collection</a></li><ul><li><a href=#tcp-attributes>TCP attributes</a></li></ul><li><a href=#cleanup>Cleanup</a></li><li><a href=#see-also>See also</a></li></ul></nav></div></nav></div></div></div><footer class="d-print-none container-fluid"><div class=row><div class="col-5 col-lg-4" role=navigation><div class=container-fluid><div class=row><div class=icon><span>discuss</span>
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<a title="Interactively discuss issues with the Istio community on Slack" href=https://istio.slack.com aria-label=slack><svg viewBox="0 0 31.444 31.443"><path d="M31.202 16.369c-.62-1.388-2.249-2.011-3.637-1.391l-1.325.594-3.396-7.591 1.325-.592c1.388-.622 2.01-2.25 1.389-3.637-.62-1.389-2.248-2.012-3.637-1.39l-1.324.593-.593-1.326c-.621-1.388-2.249-2.009-3.637-1.388-1.388.62-2.009 2.247-1.389 3.637l.593 1.325L7.98 8.598 7.388 7.273c-.621-1.39-2.249-2.009-3.637-1.39C2.363 6.504 1.742 8.132 2.362 9.52l.592 1.324L1.63 11.438c-1.388.621-2.01 2.247-1.389 3.636.62 1.388 2.249 2.01 3.637 1.39l1.325-.594 3.394 7.592-1.325.592c-1.388.621-2.009 2.25-1.389 3.637.621 1.389 2.249 2.011 3.637 1.391l1.324-.593.593 1.325c.621 1.389 2.249 2.01 3.637 1.389 1.387-.62 2.009-2.248 1.388-3.636l-.591-1.326 7.591-3.394.592 1.321c.621 1.391 2.248 2.013 3.637 1.392 1.388-.619 2.01-2.248 1.389-3.637l-.592-1.324 1.323-.594C31.201 19.384 31.823 17.757 31.202 16.369zM13.623 21.215l-3.395-7.593 7.591-3.394 3.395 7.591L13.623 21.215z"/></svg></a></div><div class=icon><span>twitter</span>
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<a title="Follow us on Twitter to get the latest news" href=https://twitter.com/IstioMesh aria-label=Twitter><svg viewBox="0 0 310 310"><path d="M302.973 57.388c-4.87 2.16-9.877 3.983-14.993 5.463 6.057-6.85 10.675-14.91 13.494-23.73.632-1.977-.023-4.141-1.648-5.434-1.623-1.294-3.878-1.449-5.665-.39-10.865 6.444-22.587 11.075-34.878 13.783-12.381-12.098-29.197-18.983-46.581-18.983-36.695.0-66.549 29.853-66.549 66.547.0 2.89.183 5.764.545 8.598C101.163 99.244 58.83 76.863 29.76 41.204c-1.036-1.271-2.632-1.956-4.266-1.825-1.635.128-3.104 1.05-3.93 2.467-5.896 10.117-9.013 21.688-9.013 33.461.0 16.035 5.725 31.249 15.838 43.137-3.075-1.065-6.059-2.396-8.907-3.977-1.529-.851-3.395-.838-4.914.033-1.52.871-2.473 2.473-2.513 4.224-.007.295-.007.59-.007.889.0 23.935 12.882 45.484 32.577 57.229-1.692-.169-3.383-.414-5.063-.735-1.732-.331-3.513.276-4.681 1.597-1.17 1.32-1.557 3.16-1.018 4.84 7.29 22.76 26.059 39.501 48.749 44.605-18.819 11.787-40.34 17.961-62.932 17.961-4.714.0-9.455-.277-14.095-.826-2.305-.274-4.509 1.087-5.294 3.279-.785 2.193.047 4.638 2.008 5.895 29.023 18.609 62.582 28.445 97.047 28.445 67.754.0 110.139-31.95 133.764-58.753 29.46-33.421 46.356-77.658 46.356-121.367.0-1.826-.028-3.67-.084-5.508 11.623-8.757 21.63-19.355 29.773-31.536 1.237-1.85 1.103-4.295-.33-5.998C307.394 57.037 305.009 56.486 302.973 57.388z"/></svg></a></div><div class=icon><span>stack overflow</span>
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<a title="Stack Overflow is where you can ask questions and find curated answers on deploying, configuring, and using Istio" href=https://stackoverflow.com/questions/tagged/istio aria-label="Stack Overflow"><svg viewBox="0 0 120 120"><polygon points="84.4,93.8 84.4,70.6 92.1,70.6 92.1,101.5 22.6,101.5 22.6,70.6 30.3,70.6 30.3,93.8"/><path d="M38.8 68.4l37.8 7.9 1.6-7.6-37.8-7.9L38.8 68.4zM43.8 50.4l35 16.3 3.2-7-35-16.4L43.8 50.4zM53.5 33.2l29.7 24.7 4.9-5.9L58.4 27.3 53.5 33.2zM72.7 14.9l-6.2 4.6 23 31 6.2-4.6-23-31zM38 86h38.6v-7.7H38V86z"/></svg></a></div></div><div class="tag row d-none d-lg-flex">for everyone</div></div></div><div class="col-7 col-lg-4"><p class="text-center copyright" role=contentinfo>Istio
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Archive
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1.0<br>© 2019 Istio Authors, <a href=https://policies.google.com/privacy>Privacy Policy</a><br>Archived on March 19, 2019</p></div><div class="col-6 col-lg-4 d-none d-lg-flex" role=navigation><div class=container-fluid><div class="row justify-content-end"><div class=icon><span>github</span>
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<a title="Access our team drive if you'd like to take a look at the Istio technical design documents" href=https://groups.google.com/forum/#!forum/istio-team-drive-access aria-label="team drive"><svg viewBox="0 0 207.027 207.027"><path d="M69.866 15.557.0 138.919l28.732 52.552 143.288-.029 35.008-59.588L136.39 15.735 69.866 15.557zM17.166 139.046 74.268 38.205 91.21 67.783 33.24 168.447 17.166 139.046zM99.841 82.851l23.805 41.558-47.732-.006L99.841 82.851zM163.434 176.443l-117.332.024 21.53-37.065 64.606.008.067.119 52.865-.085L163.434 176.443zM140.932 124.411 90.157 35.767l-2.966-5.178 40.751.121 57.003 93.706L140.932 124.411z"/></svg></a></div><div class=icon><span>working groups</span>
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<a title="If you'd like to contribute to the Istio project, consider participating in our working groups" href=https://github.com/istio/community/blob/master/WORKING-GROUPS.md aria-label="working groups"><svg viewBox="0 -45 439.833 439.833"><polygon points="246.048,195.833 299.966,235.085 319.497,227.296 276.278,195.833"/><polygon points="193.786,195.833 163.556,195.833 120.33,227.3 139.862,235.089"/><path d="M219.927 11.558c-23.854.0-37.057 12.362-36.814 36.182.348 32.623 14.211 52.414 36.814 52.068.0.0 36.802 1.492 36.802-52.068C256.729 23.918 244.294 11.558 219.927 11.558z"/><path d="M285.017 124.567l-36.77-14.659-8.608-7.256c-2.274-1.922-5.636-1.78-7.741.317l-11.973 11.904-12.008-11.907c-2.109-2.094-5.465-2.229-7.736-.313l-8.611 7.256-36.77 14.661c-11.842 4.715-11.83 46.647-12.848 50.497h155.93C296.866 171.228 296.862 129.28 285.017 124.567z"/><path d="M77.976 228.568s36.801 1.492 36.801-52.068c0-23.82-12.434-36.182-36.801-36.182-23.854.0-37.057 12.362-36.814 36.182C41.509 209.124 55.372 228.915 77.976 228.568z"/><path d="M143.065 253.329l-36.77-14.658-8.609-7.256c-2.275-1.923-5.635-1.781-7.742.315l-11.971 11.904-12.008-11.908c-2.109-2.094-5.465-2.229-7.736-.312l-8.611 7.256-36.77 14.66C1.006 258.045 1.018 299.977.0 303.827h155.93C154.915 299.988 154.911 258.042 143.065 253.329z"/><path d="M361.878 228.568s36.801 1.492 36.801-52.068c0-23.82-12.434-36.182-36.801-36.182-23.854.0-37.057 12.362-36.812 36.182C325.411 209.124 339.274 228.915 361.878 228.568z"/><path d="M426.968 253.329l-36.77-14.658-8.609-7.256c-2.273-1.923-5.635-1.781-7.742.315l-11.971 11.904-12.008-11.908c-2.109-2.094-5.465-2.229-7.736-.312l-8.61 7.256-36.771 14.66c-11.842 4.715-11.83 46.646-12.848 50.497h155.93C438.817 299.988 438.812 258.042 426.968 253.329z"/></svg></a></div></div><div class="tag row justify-content-end text-right">for developers</div></div></div></div></footer><div class="d-xl-none d-print-none"><button id=scroll-to-top aria-hidden=true onclick=scrollToTop() title="Back to top"><i class="fa fa-lg fa-arrow-up"></i></button></div><script src=https://code.jquery.com/jquery-3.2.1.slim.min.js integrity=sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN crossorigin=anonymous></script><script src=https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js integrity=sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl crossorigin=anonymous></script><script src=https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/1.7.1/clipboard.min.js></script><script src="https://www.google.com/cse/brand?form=search_form"></script><script src=/v1.0/js/all.min.js data-manual></script></body></html> |