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Knative Observability

This repo contains a set of in-progress resources designed to be a lightweight, extensible, and easy-to-understand set of tools for cluster admins and app developers to egress logs and metrics.

Setup

Clone the repository into your GOPATH

go get github.com/knative/observability

Deploying the Sink Resources

The sink resources can be used without Knative, the only pre-requisite is a cluster and ko tool. To deploy simply run the following command from the observability repo directory.

KO_DOCKER_REPO=gcr.io/<GCP_PROJECT_ID>/<BUCKET> ko apply -Rf config

Using the Log Sink with Knative

Operators who for regulatory or security reasons want to monitor logs for every workload on the cluster can use the clusterlogsink. App developers will want to create a logsink for their namespace. To define a logsink, apply a yaml similar to the example below:

apiVersion: observability.knative.dev/v1alpha1
kind: LogSink
metadata:
  name: logspinner
spec:
  type: syslog
  host: example.com
  port: 25954
  enable_tls: true

More examples of logsinks, as well as other resources can be found in the test/crd/valid directory.

The logsinks and clusterlogsinks can be viewed as follows:

kubectl get logsinks
kubectl get clusterlogsinks

Using the Cluster Metric Sink with Knative

Operators who wish to gather metrics about running pods and containers can use the clustermetricsink resource. The telegraf kubernetes input plugin is always configured and cannot be removed. At least one output needs to be provided.

The following example routes kubernetes cluster metrics to datadog.

apiVersion: observability.knative.dev/v1alpha1
kind: ClusterMetricSink
metadata:
  name: cluster-metric-sink
spec:
  outputs:
  - type: datadog
    apikey: "datadog-apikey"

Refer to Telegraf's documentation for other configurable inputs and outputs.

The clustermetricsinks can be viewed as follows:

kubectl get clustermetricsinks

Using the Namespaced Metric Sink with Knative

For developers who want to obtain metrics from within their namespace they can use the metricsink resource. The telegraf agent is deployed as a deployment within the namespace along with a respective configmap.

It can be configured as follows:

apiVersion: observability.knative.dev/v1alpha1
kind: MetricSink
metadata:
  name: metric-sink
spec:
  inputs:
  - type: exec
    commands:
    - "echo 5"
    data_format: "value"
    data_type: "integer"
    name_override: "test"
  outputs:
  - type: datadog
    apikey: apikey

Refer to Telegraf's documentation for other configurable inputs and outputs.

The metricsinks can be viewed as follows:

kubectl get metricsinks

Developer Notes

The validator and cert-generator images have Dockerfiles and will not be built using the ko command. They can be built in the following way:

# From the root of the project directory
docker build --tag cert-generator:dev --file cmd/cert-generator/Dockerfile .
docker build --tag validator:dev --file cmd/validator/Dockerfile .

and in development should be built, uploaded, and changed in the manifest for testing. The telegraf and fluent-bit images are also external to this repository, the later can be found at fluent-bit-out-syslog plugin.

Run Tests

See the Test README

Technologies

The observability project takes advantage of both fluent-bit and telegraf to egress metrics and logs. Telegraf is required to run the validating webhook tests, fluent-bit is not required to run any tests. Fluent-bit is run with the fluent-bit-out-syslog plugin to allow for syslog egress for logs.