micrometer-metrics/micrometer

Cache baseline JARs on CI

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#7102 opened on Jan 21, 2026

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buildhelp wantedtype: task

Description

https://app.circleci.com/pipelines/github/micrometer-metrics/micrometer/11311/workflows/78f87759-0807-45d7-8045-9a66d945481e/jobs/62275

We had a CI build failure:

Execution failed for task ':micrometer-registry-statsd:downloadBaseline'.
> A failure occurred while executing de.undercouch.gradle.tasks.download.internal.DefaultWorkerExecutorHelper$DefaultWorkAction
   > de.undercouch.gradle.tasks.download.org.apache.hc.core5.http.NoHttpResponseException: The target server failed to respond

I've never seen this before so it's not been a significant issue, but each branch will always download the same baseline versions, which makes it a good candidate to include in the CI cache, so it doesn't repeatedly download the same JARs every CI build.

Contributor guide

Tech stack
java
Domain
build systemci cd
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
GradleCircleCI
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Examine the CircleCI configuration (likely .circleci/config.yml) to locate where the `downloadBaseline` Gradle task is invoked and which JARs are downloaded. Implement caching similar to existing cache steps (e.g., for Gradle dependencies) using a cache key based on the checksum of the baseline version file. Refer to CircleCI documentation on save/restore cache. Test by running a CI build to ensure cache is populated and reused.