linkerd2/doc/proxy-metrics.md

+++ title = "Proxy Metrics" docpage = true [menu.docs] parent = "proxy-metrics" +++

The Conduit proxy exposes metrics that describe the traffic flowing through the proxy. The following metrics are available at /metrics on the proxy's metrics port (default: :4191) in the Prometheus format:

request_total

A counter of the number of requests the proxy has received. This is incremented when the request stream begins.

request_duration_ms

A histogram of the duration of a request. This is measured from when the request headers are received to when the request stream has completed.

response_total

A counter of the number of responses the proxy has received. This is incremeneted when the response stream ends.

response_duration_ms

A histogram of the duration of a response. This is measured from when the response headers are received to when the response stream has completed.

response_latency_ms

A histogram of the total latency of a response. This is measured from when the request headers are received to when the response stream has completed.

Labels

Each of these metrics has the following labels:

• direction: inbound if the request originated from outside of the pod, outbound if the request originated from inside of the pod.
• deployment: The deployment that the pod belongs to (if applicable).
• job: The job that the pod belongs to (if applicable).
• replica_set: The replica set that the pod belongs to (if applicable).
• daemon_set: The daemon set that the pod belongs to (if applicable).
• replication_controller: The replication controller that the pod belongs to (if applicable).
• authority: The value of the :authority (HTTP/2) or Host (HTTP/1.1) header of the request.
• dst_deployment: The deployment to which this request is being sent. Only applicable if direction=outbound.
• dst_job: The job to which this request is being sent. Only applicable if direction=outbound.
• dst_replica_set: The replica set to which this request is being sent. Only applicable if direction=outbound.
• dst_daemon_set: The daemon set to which this request is being sent. Only applicable if direction=outbound.
• dst_replication_controller: The replication controller to which this request is being sent. Only applicable if direction=outbound.
• dst_namespace: The namespace to which this request is being sent. Only applicable if direction=outbound.
• status_code: The HTTP status code of the response. Only applicable to response metrics.
• grpc_status_code: The value of the grpc-status trailer. Only applicable to response metrics for gRPC responses.

Note that the instance and namespace labels will typically be added by the Prometheus collector.