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PromQL Compliance Tester

The PromQL Compliance Tester is a tool for running comparison tests between native Prometheus and vendor PromQL API implementations.

The tool was first published and described in August 2020. Test results have been published on 2020-08-06 and 2020-12-01.

Building via Docker

If you have docker installed, you can build the tool using docker.

make docker

Building from source

Requirements

This tool is written in Go and requires a working Go setup to build. Library dependencies are handled via Go Modules.

Building

To build the tool:

go build ./cmd/promql-compliance-tester

Executing

The tool allows setting the following flags:

$ ./promql-compliance-tester -h
Usage of ./promql-compliance-tester:
  -config-file value
    	The path to the configuration file. If repeated, the specified files will be concatenated before YAML parsing.
  -output-format string
    	The comparison output format. Valid values: [text, html, json] (default "text")
  -output-html-template string
    	The HTML template to use when using HTML as the output format. (default "./output/example-output.html")
  -output-passing
    	Whether to also include passing test cases in the output.
  -query-parallelism int
    	Maximum number of comparison queries to run in parallel. (default 20)

Running the tool will execute all test cases in -config-file and compare results between reference and target provided in the same file.

At the end of the run, the output is provided in the form of the number of executed tests and errors if any. Example output can be seen here:

./promql-compliance-tester -config-file config.yaml -config-file ./promql-test-queries.yml
529 / 529 [-----------------------------------------------------------------------------------------------------------] 100.00% 278 p/s
Total: 529 / 529 (100.00%) passed, 0 unsupported

If all tests were executed correctly and passing the tool returns a 0 exit code, otherwise it returns 1.

Configuration

A standard suite of test cases is defined in the promql-test-queries.yml file, while separate test-<vendor>.yml config files specify test target configurations and query tweaks for a number of individual projects and vendors. To run the tester tool, you need to specify both the test suite config file as well as a config file for a single vendor.

For example, to run the tester against Cortex:

./promql-compliance-tester -config-file=promql-test-queries.yml -config-file=test-cortex.yml

Note that some of the vendor-specific configuration files require you to replace certain placeholder values for endpoints and credentials before using them.

Testing your implementation for compliance

We encourage projects and vendors to test their implementations for PromQL compliance. To do this, follow these steps:

  1. Check out this repository: git clone git@github.com:prometheus/compliance.
  2. Change into the repo's promql directory: cd compliance/promql.
  3. Either edit the appropriate test-<vendor>.yml file for your project or service or create a new test target configuration file to be able to query from both your reference Prometheus server and your PromQL-compatible datasource.
  4. Edit prometheus-test-data.yml to either add a remote_write section for your system or make any other adjustments that are necessary to enable propagation of the scraped data to your system (e.g. adding external labels for Thanos).
  5. Run a reference Prometheus server that ingests the expected test data (we assume that you have Prometheus installed): prometheus --config.file=prometheus-test-data.yml.
  6. Wait for at least one hour for sufficient test data to be ingested into both the reference Prometheus server and the system to be tested.
  7. Build the tester tool: go build ./cmd/promql-compliance-tester.
  8. Run the tester tool (replacing <vendor> as appropriate): ./promql-compliance-tester -config-file=promql-test-queries.yml -config-file=test-<vendor>.yml.

If the tool reports a test score of 100% without any cross-cutting query tweaks, your implementation is PromQL-compliant.

Contributing

Help is wanted to improve the PromQL Compliance Tester. In particular, we would love to add and improve the following points:

  • Test instant queries in addition to range queries.
  • Add more variation and configurability to input timestamps.
  • Flesh out a more comprehensive (and less overlapping) set of input test queries.
  • Automate and integrate data loading into different systems.
  • Test more vendor implementations of PromQL.
  • Version test results and make pretty output presentations easier.

Note: Many people will be interested in benchmarking performance differences between PromQL implementations. While this is important as well, the PromQL Compliance Tester focuses solely on correctness testing. Please contact the maintainers if you want to work on performance testing.

If you would like to help flesh out the tester, please file issues or pull requests.