the-smooth-operator/cortex-rules-action

Cortextool Github Action

This action is used to lint, prepare, verify, diff, and sync rules to a Cortex cluster.

Environment Variables

This action is configured using environment variables defined in the workflow. The following variables can be configured.

Name	Description	Required	Default
CORTEX_ADDRESS	URL address for the target Cortex cluster	false	N/A
CORTEX_TENANT_ID	ID for the desired tenant in the target Cortex cluster. Used as the username under HTTP Basic authentication.	false	N/A
CORTEX_API_KEY	Optional password that is required for password-protected Cortex clusters. An encrypted github secret is recommended. Used as the password under HTTP Basic authentication.	false	N/A
ACTION	Which action to take. One of lint, prepare, check, diff or sync	true	N/A
RULES_DIR	Comma-separated list of directories to walk in order to source rules files	false	./
LABEL_EXCLUDED_RULE_GROUPS	Comma separated list of rule group names to exclude when including the configured label to aggregations. This option is supported only by the prepare action.	false	N/A
NAMESPACES	Comma-separated list of namespaces to use	false	N/A

Authentication

This GitHub Action uses cortextool under the hood, cortextool uses HTTP Basic authentication against a Cortex cluster. The variable CORTEX_TENANT_ID is used as the username and CORTEX_API_KEY as the password.

Actions

All actions will crawl the specified RULES_DIR for Prometheus rules and alerts files with a yaml/yml extension.

diff

Outputs the differences in the configured files and the currently configured ruleset in a Cortex cluster. It will output the required operations in order to make the running Cortex cluster match the rules configured in the directory. It will not create/update/delete any rules currently running in the Cortex cluster.

sync

Reconcile the differences with the sourced rules and the rules currently running in a configured Cortex cluster. It will create/update/delete rules currently running in Cortex to match what is configured in the files in the provided directory.

lint

Lints a rules file(s). The linter's aim is not to verify correctness but to fix YAML and PromQL expression formatting within the rule file(s). The linting happens in-place within the specified file(s). Does not interact with your Cortex cluster.

prepare

Prepares a rules file(s) for upload to Cortex. It lints all your PromQL expressions and adds a cluster label to your PromQL query aggregations in the file. Prepare modifies the file(s) in-place. Does not interact with your Cortex cluster.

check

Checks rules file(s) against the recommended best practices for rules. Does not interact with your Cortex cluster.

print

fetch & print rules from the Cortex cluster.

Outputs

summary

The summary output variable is a string denoting the output summary of the action, if there is one.

detailed

The detailed output variable returned by this action is the full output of the command executed.

Example Workflows

Pull Request Diff

The following workflow will run a diff on every pull request against the repo and print the summary as a comment in the associated pull request:

name: diff_rules_pull_request
on: [pull_request]
jobs:
  diff-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Diff Rules
        id: diff_rules
        uses: grafana//cortex-rules-action@v0.8.0
        env:
          CORTEX_ADDRESS: https://example-cluster.com/
          CORTEX_TENANT_ID: 1
          CORTEX_API_KEY: ${{ secrets.CORTEX_API_KEY }} # Encrypted Github Secret https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets
          ACTION: diff
          RULES_DIR: "./rules/" # In this example rules are stored in a rules directory in the repo
      - name: comment PR
        uses: unsplash/comment-on-pr@v1.2.0 # https://github.com/unsplash/comment-on-pr
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          msg: "${{ steps.diff_rules.outputs.summary }}" # summary could be replaced with detailed for a more granular view

Master Sync

The following workflow will sync the rule files in the master branch with the configured Cortex cluster.

name: sync_rules_master
on:
 push:
   branches:
     - master
jobs:
  sync-master:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: master
      - name: sync-rules
        uses: grafana//cortex-rules-action@v0.8.0
        env:
          CORTEX_ADDRESS: https://example-cluster.com/
          CORTEX_TENANT_ID: 1
          CORTEX_API_KEY: ${{ secrets.CORTEX_API_KEY }} # Encrypted Github Secret https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets
          ACTION: sync
          RULES_DIR: "./rules/" # In this example rules are stored in a rules directory in the repo