Description
Our current Grafana dashboards provide a great overview of test suite health, including a panel for "Top failed tests." However, identifying which of these failures are due to legitimate bugs versus intermittent "flaky tests" is a manual, time-consuming process. These flaky tests erode trust in our test suites and slow down development.
This project aims to build a simple but powerful Python script that automates flaky test detection. The script will directly query our Prometheus instance for the historical data of each failed test, using the jenkins_build_test_case_failure_age metric. It will then format this data and send it to the Gemini API with a carefully crafted prompt, asking it to identify which tests show a flaky pattern.
The final output will be a clean JSON list of the most probable flaky tests, which can then be used to populate a new "Top Flaky Tests" panel in our existing Grafana test suite dashboard.
Goals
By the end of Hack Week, we aim to have a single, working Python script that:
- Connects to Prometheus and executes a query to fetch detailed test failure history.
- Processes the raw data into a format suitable for the Gemini API.
- Successfully calls the Gemini API with the data and a clear prompt.
- Parses the AI's response to extract a simple list of flaky tests.
- Saves the list to a JSON file that can be displayed in Grafana.
- New panel in our Dashboard listing the Flaky tests
Resources
- Jenkins Prometheus Exporter: https://github.com/uyuni-project/jenkins-exporter/
- Data Source: Our internal Prometheus server.
- Key Metric:
jenkins_build_test_case_failure_age{jobname, buildid, suite, case, status, failedsince}. - Existing Query for Reference:
count by (suite) (max_over_time(jenkins_build_test_case_failure_age{status=~"FAILED|REGRESSION", jobname="$jobname"}[$__range])). - AI Model: The Google Gemini API.
- Example about how to interact with Gemini API: https://github.com/srbarrios/FailTale/
- Visualization: Our internal Grafana Dashboard.
- Internal IaC: https://gitlab.suse.de/galaxy/infrastructure/-/tree/master/srv/salt/monitoring
Outcome
- Jenkins Flaky Test Detector: https://github.com/srbarrios/jenkins-flaky-tests-detector and its container
- IaC on MLM Team: https://gitlab.suse.de/galaxy/infrastructure/-/tree/master/srv/salt/monitoring/jenkinsflakytestsdetector?reftype=heads, https://gitlab.suse.de/galaxy/infrastructure/-/blob/master/srv/salt/monitoring/grafana/dashboards/flaky-tests.json?ref_type=heads, and others.
- Grafana Dashboard: https://grafana.mgr.suse.de/d/flaky-tests/flaky-tests-detection @ @ text
Looking for hackers with the skills:
This project is part of:
Hack Week 25
Activity
Comments
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about 1 month ago by oscar-barrios | Reply
The code of the flaky detector is here: https://github.com/srbarrios/jenkins-flaky-tests-detector
I also published a Docker container to use it here: https://github.com/srbarrios/jenkins-flaky-tests-detector/pkgs/container/jenkins-flaky-tests-detector
The plan now is to write a Salt state in our MLM internal infra, so it runs this container, it expose the results in a web server running on the container, and then I parse it on Grafana.
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about 1 month ago by oscar-barrios | Reply
I created the new Grafana dashboard for Uyuni here: https://grafana.mgr.suse.de/d/flaky-tests/flaky-tests-detection?orgId=1&from=now-6h&to=now&timezone=browser&refresh=1m
Next step now is to build it in a way that I can get the flaky tests for all the Jenkins job test results that we monitoring in MLM.
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about 1 month ago by oscar-barrios | Reply
Now we can select any of the running test suites, and get a list of the most probable flaky tests :)
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about 1 month ago by oscar-barrios | Reply
I will consider this hackweek done for now, to move to my second hackweek project. The outcome it has been good, I must admit that I also vibe coded some parts using Gemini 3. Also, the script analyzing the prometheus series is not relying only on a LLM call, but it also do a first triage based on a simple algorithm, saving resources to ask AI only for ambiguos and complex test failures.
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