Switch diffCoverage plugin to deltaCoverage

[dbwiddis]

Description

Removes the abandonware diffCoverage plugin and replaces it with deltaCoverage.

Issues Resolved

Fixes #761

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.37%. Comparing base (dae810c) to head (aa3eb77).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #762   +/-   ##
=========================================
  Coverage     74.37%   74.37%           
  Complexity      745      745           
=========================================
  Files            84       84           
  Lines          3825     3825           
  Branches        333      333           
=========================================
  Hits           2845     2845           
  Misses          825      825           
  Partials        155      155           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[amitgalitz]

Mend security failing here

[dbwiddis]

Mend security failing here

It's been flaky for the past several days across multiple repos... something about its token. Retrying usually works.

[owaiskazi19]

Is this something we are changing in core as well? We were using diffCoverage to be same across all the repos under opensearch-project

[dbwiddis]

Is this something we are changing in core as well? We were using diffCoverage to be same across all the repos under opensearch-project

That's codecov that you're thinking of. That won't change, we'll still get the PR comments with the coverage diff, see #763 (comment)

This is a local command you can type, that's only implemented in our plugin and the Extensions SDK, that the maintainer abandoned, and which doesn't support JDK21. Someone's moved forward with a fork of that.

So I can locally run ./gradlew test deltaCoverage before even submitting a PR, and get a html report that looks like this:

The details match CodeCov exactly.