retry deleting folder (#1042)

docs/serving/fluentd/fluentd-requirements.md

@@ -1,53 +0,0 @@
----
-title: "Fluentd container image requirements"
-linkTitle: "Fluentd requirements"
-weight: 10
-type: "docs"
----
-
-Knative Serving uses a [Fluentd](https://www.fluentd.org/) docker image to
-collect logs. Operators can customize their own Fluentd docker image and
-configuration to define logging output.
-
-## Requirements
-
-Knative requires the customized Fluentd docker image with the following plugins
-installed:
-
-- [fluentd](https://github.com/fluent/fluentd) >= v0.14.0
-- [fluent-plugin-kubernetes_metadata_filter](https://github.com/fabric8io/fluent-plugin-kubernetes_metadata_filter) >=
-  1.0.0 AND < 2.1.0: To enrich log entries with Kubernetes metadata.
-- [fluent-plugin-detect-exceptions](https://github.com/GoogleCloudPlatform/fluent-plugin-detect-exceptions) >=
-  0.0.9: To combine multi-line exception stack traces logs into one log entry.
-- [fluent-plugin-multi-format-parser](https://github.com/repeatedly/fluent-plugin-multi-format-parser) >=
-  1.0.0: To detect log format as Json or plain text.
-
-## Sample images
-
-Operators can use any Docker image which meets the requirements above and
-includes the desired output plugin. Two examples below:
-
-### Send logs to Elasticsearch
-
-Operators can use
-[k8s.gcr.io/fluentd-elasticsearch:v2.0.4](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/fluentd-elasticsearch/fluentd-es-image)
-which includes
-[fluent-plugin-elasticsearch](https://github.com/uken/fluent-plugin-elasticsearch)
-that allows sending logs to a Elasticsearch service.
-
-### Send logs to Stackdriver
-
-This sample [Dockerfile](./stackdriver/Dockerfile) is based on
-[k8s.gcr.io/fluentd-elasticsearch:v2.0.4](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/fluentd-elasticsearch).
-It additionally adds one more plugin -
-[fluent-plugin-google-cloud](https://github.com/GoogleCloudPlatform/fluent-plugin-google-cloud)
-which allows sending logs to Stackdriver.
-
-Operators can build this image and push it to a container registry which their
-Kubernetes cluster has access to. See
-[Setting Up A Logging Plugin](../setting-up-a-logging-plugin.md) for
-details. **NOTE**: Operators need to add credentials file the stackdriver agent
-needs to the docker image if their Knative Serving is not built on a GCP based
-cluster or they want to send logs to another GCP project. See
-[here](https://cloud.google.com/logging/docs/agent/authorization) for more
-information.