ci(sentry): Shard sentry tests over 16 runners#8037
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Increase the sentry test matrix from 4 to 16 instances to reduce wall-clock time of the sentry job. The round-robin grouping is driven by the matrix instance count and MATRIX_INSTANCE_TOTAL, so both are bumped in lockstep. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Agent transcript: https://claudescope.sentry.dev/share/cg8C9Pe7N50McOUx8dm5I5EwAl24Tars1RrzsNzWFrE
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Increase the
sentryjob's test matrix from 4 to 16 instances to cut wall-clock time of the cross-repo sentry test run.Sharding is driven by round-robin grouping: the
setup-sentryaction reads the matrix instance and exportsTEST_GROUP/TOTAL_TEST_GROUPS, and sentry's pytest plugin keeps onlyhash(test) % TOTAL_TEST_GROUPS == TEST_GROUP. Both knobs are bumped in lockstep, as the inline comment requires.Tradeoff
Each shard pays a fixed setup cost (image load, sentry checkout, devservices, snuba migrations) regardless of test volume, so this trades ~4x runner-minutes for faster wall-clock and won't yield a full 4x speedup. Worth watching per-shard timing after merge to confirm 16 beats a smaller count like 8.
🤖 Generated with Claude Code
Agent transcript: https://claudescope.sentry.dev/share/yP9pFj3TliBk-_-vXWAKh7eHEAJil2TLbhmu92JgDVk