Prometheus GitHub Exporter

Exposes basic metrics for your repositories from the GitHub API, to a Prometheus compatible endpoint.

Configuration

This exporter is configured via environment variables. All variables are optional unless otherwise stated. Below is a list of supported configuration values:

Variable	Description	Default
ORGS	Comma-separated list of GitHub organizations to monitor (e.g. org1,org2).
REPOS	Comma-separated list of repositories to monitor (e.g. user/repo1,user/repo2).
USERS	Comma-separated list of GitHub users to monitor (e.g. user1,user2).
GITHUB_TOKEN	GitHub personal access token for API authentication.
GITHUB_TOKEN_FILE	Path to a file containing a GitHub personal access token.
GITHUB_APP	Set to true to authenticate as a GitHub App.	false
GITHUB_APP_ID	The App ID of the GitHub App. Required if GITHUB_APP is true.
GITHUB_APP_INSTALLATION_ID	The Installation ID of the GitHub App. Required if GITHUB_APP is true.
GITHUB_APP_KEY_PATH	Path to the GitHub App private key file. Required if GITHUB_APP is true.
GITHUB_RATE_LIMIT_ENABLED	Whether to fetch GitHub API rate limit metrics (true or false).	true
GITHUB_RATE_LIMIT	Core API quota threshold for proactive GitHub App token refresh. When the remaining core requests drop below this value, a new installation token is requested. 0 disables this behaviour.	0
GITHUB_RESULTS_PER_PAGE	Number of results to request per page from the GitHub API (max 100).	100
FETCH_REPO_RELEASES_ENABLED	Whether to fetch repository release metrics (true or false).	true
FETCH_ORGS_CONCURRENCY	Number of concurrent requests to make when fetching organization data.	1
FETCH_ORG_REPOS_CONCURRENCY	Number of concurrent requests to make when fetching organization repository data.	1
FETCH_USERS_CONCURRENCY	Number of concurrent requests to make when fetching user data.	1
FETCH_USERS_CONCURRENCY	Number of concurrent requests to make when fetching repository data.	1
API_URL	GitHub API URL. You should not need to change this unless using GitHub Enterprise.	https://api.github.com
LISTEN_PORT	The port the exporter will listen on.	9171
METRICS_PATH	The HTTP path to expose Prometheus metrics.	/metrics
LOG_LEVEL	Logging level (debug, info, warn, error).	info

Credential Precedence

When authenticating with the GitHub API, the exporter uses credentials in the following order of precedence:

1. GitHub App credentials (GITHUB_APP=true with GITHUB_APP_ID, GITHUB_APP_INSTALLATION_ID, and GITHUB_APP_KEY_PATH): If enabled, the exporter authenticates as a GitHub App and ignores any personal access token or token file.
2. Token file (GITHUB_TOKEN_FILE): If a token file is provided (and GitHub App is not enabled), the exporter reads the token from the specified file.
3. Direct token (GITHUB_TOKEN): If neither GitHub App nor token file is provided, the exporter uses the token supplied directly via the environment variable.

If none of these credentials are provided, the exporter will make unauthenticated requests, which are subject to very strict rate limits.

Install and deploy

Run manually from Docker Hub:

docker run -d --restart=always -p 9171:9171 -e REPOS="infinityworks/ranch-eye, infinityworks/prom-conf" githubexporter/github-exporter

Run manually from Docker Hub (With GitHub App):

docker run -d --restart=always -p 9171:9171 --read-only -v ./key.pem:/key.pem -e GITHUB_APP=true -e GITHUB_APP_ID= -e GITHUB_APP_INSTALLATION_ID= -e GITHUB_APP_KEY_PATH=/key.pem <IMAGE_NAME>

Build a docker image:

docker build -t <image-name> .

Docker compose

github-exporter:
tty: true
stdin_open: true
expose:
- 9171
ports:
- 9171:9171
image: githubexporter/github-exporter:latest
environment:
- REPOS=<REPOS you want to monitor>
- GITHUB_TOKEN=<your github api token>

Docker compose (GitHub App)

github-exporter-github-app:
tty: true
stdin_open: true
expose:
- 9171
ports:
- 9171:9171
build: .
environment:
- LOG_LEVEL=debug
- LISTEN_PORT=9171
- GITHUB_APP=true
- GITHUB_APP_ID=
- GITHUB_APP_INSTALLATION_ID=
- GITHUB_APP_KEY_PATH=/key.pem
restart: unless-stopped
volumes:
- "./key.pem:/key.pem:ro"

Metrics

Metrics will be made available on port 9171 by default An example of these metrics can be found in the METRICS.md markdown file in the root of this repository

Tests

There is a set of blackbox behavioural tests which validate metrics endpoint in the test directory. Run as follows

make test

Version Release Procedure

Once a new pull request has been merged into master the following script should be executed locally. The script will trigger a new image build in docker hub with the new image having the tag release-<version>. The version is taken from the VERSION file and must follow semantic versioning. For more information see semver.org.

Prior to running the following command ensure the number has been increased to desired version in VERSION:

./release-version.sh

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