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* ci: fit weekly test-durations refresh inside the 6h limit and alert on failure The serial full-suite run no longer fits the 6h job limit; every weekly run since mid-2025 was cancelled at exactly 6h, so .test_durations silently froze and the 5 CI test groups drifted out of balance (the recurring "Group 3 times out at 99%" nightly failures). - Measure durations as a 5-group matrix (same pytest-split groups, same xdist and test selection as make unit_tests), ~45-60 min per group instead of >6h serial. Each group stores only its own tests' durations (clean-durations); a merge job unions the disjoint group files and sanity-checks coverage before committing anything. - Add job-level timeouts everywhere and a Slack alert job (LANGFLOW_ENG_SLACK_WEBHOOK_URL, same channel as nightly_build) so a silent freeze cannot recur unnoticed. - Label the auto-PR skip-nightly-check: the required CI Success check previously failed on these PRs whenever the nightly was red, which is why none of them (#6225..#8669) ever merged. - Dispatch ci.yml on the PR branch after creation: PRs created with the default GITHUB_TOKEN never trigger pull_request workflows, so the required checks otherwise never run. workflow_dispatch is exempt from that restriction and from the nightly gate. Optionally supports a DURATIONS_PR_TOKEN PAT for fully native triggering. - Request review/assign so the PR gets attention instead of rotting. - Commit only .test_durations (add-paths) and drop the unused ASTRA/OPENAI api_key_required test env (CI never runs those tests). * ci: paginate the stale-durations-PR close step pulls.list returns one page (30) and the repo has hundreds of open PRs, so months-old stale durations PRs never appeared in the results — that is how #6225..#8669 accumulated unclosed even while the workflow still ran. Paginate and additionally match on the update-test-durations head branch prefix. * chore: update test durations (#13587) Co-authored-by: erichare <700235+erichare@users.noreply.github.com> * ci: fail the Slack alert step on webhook HTTP errors Without --fail-with-body, curl exits 0 on a Slack 4xx/5xx (e.g. a rotated webhook), leaving the alert job green while no alert was sent. * ci: address durations workflow review questions --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: erichare <700235+erichare@users.noreply.github.com>