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Thanos Federate Proxy

A proxy to convert /federate queries to /v1/api/query and respond in open metrics format.

The most common use case for this proxy is to be used as a side car with Thanos, to provide /federate api for thanos (currently Thanos does not support it). So this way you can add Thanos as a federation source in another prometheus. Also Thanos does not support remote write (Note that being able to write metrics remotely from thanos to another prometheus is a different concept than thanos receiver component).

Usage

Docker

sudo docker run -p 9099:9099 ghcr.io/snapp-incubator/thanos-federate-proxy:main -insecure-listen-address="0.0.0.0:9099"

Binary releases

export VERSION=0.1.0
wget https://github.com/snapp-incubator/thanos-federate-proxy/releases/download/v${VERSION}/thanos-federate-proxy-${VERSION}.linux-amd64.tar.gz
tar xvzf thanos-federate-proxy-${VERSION}.linux-amd64.tar.gz thanos-federate-proxy-${VERSION}.linux-amd64/thanos-federate-proxy

From source

git clone https://github.com/snapp-incubator/thanos-federate-proxy
cd thanos-federate-proxy && go build
./thanos-federate-proxy <optional-extra-flags>

Configuration

Flags:

  -insecure-listen-address string
        The address which proxy listens on (default "127.0.0.1:9099")
  -tlsSkipVerify
        Skip TLS Verfication (default false)
  -upstream string
        The upstream thanos URL (default "http://127.0.0.1:9090")
  -bearer-file string
        Path to file containing Authorization bearer token, if needed.
  -force-get
        Force prometheus api.Client to use GET requests instead of POST (default false)

Sample k8s deployment (as a side car with thanos or prometheus):

containers:
  ...
- name: thanos-federate-proxy
  image: ghcr.io/snapp-incubator/thanos-federate-proxy:main
  args:
  - -insecure-listen-address=0.0.0.0:9099
  - -upstream=http://127.0.0.1:9090
  ports:
  - containerPort: 9099
    name: fedproxy
    protocol: TCP

Sample prometheus config for federation:

scrape_configs:
- job_name: 'thanos-federate'
    scrape_timeout: 1m
    metrics_path: '/federate'
    params:
    'match[]':
    - 'up{namespace=~"perfix.*"}'
    static_configs:
    - targets:
        - 'thanos.svc.cluster:9099'

Limitations

The following limitations will be addressed in future releases (see Roadmap):

  • You can not pass empty matcher to prometheus for scraping all the metrics (see this prometheus issue). A workaround is to use the following matcher:

    'match[]':
  - '{__name__=~".+"}'

    Note that {__name__=~".*"} won't also work and you should use ".+" instead of ".*".

Roadmap

  • test federation
  • tlsSkipVerify flag
  • Dockerfile
  • Github actions
  • metrics
  • support multiple matchers
  • support empty matchers
  • support store-API for better performance
  • return error message instead of only logging it (??)
  • remove space after comma in metrics (causing no issues)
  • make query timeouts configurable
  • add markdown lint to CI

Metrics

Metric Notes
thanosfederateproxy_scrape_duration_seconds_count Total number of scrape requests with response code
thanosfederateproxy_scrape_duration_seconds_sum Duration of scrape requests with response code
thanosfederateproxy_scrape_duration_seconds_bucket Count of scrape requests per bucket (for calculating percentile)

Changelog

See CHANGELOG.md

Security

Reporting security vulnerabilities

If you find a security vulnerability or any security related issues, please DO NOT file a public issue, instead send your report privately to cloud@snapp.cab. Security reports are greatly appreciated and we will publicly thank you for it.

License

Apache-2.0 License, see LICENSE.