Are there any pipeline observability tools that send low-latency alerts for failing stages and test regressions?

Yes. A few pipeline observability / CI analytics tools can alert quickly on failing stages and test regressions, often via Slack, email, PagerDuty, or webhooks.

Common options

• Datadog CI Visibility
  Good for monitoring CI pipeline runs, stage duration, flaky tests, and failures. Can trigger alerts from monitors and integrate with incident tools.

• Honeycomb Useful if you instrument your pipelines and tests as events. Strong for tracing and fast querying, with alerts on anomalies or regressions.

• Buildkite Insights / Buildkite + webhooks Buildkite itself can notify on build failures, and you can wire in custom alerts for stage/test regressions.

• CircleCI Insights / Orbs + notifications Provides pipeline/test analytics and notifications; can be extended with webhooks for faster alerting.

• GitHub Actions + Actions workflow notifications Native alerts are decent, and with third-party observability you can get more advanced regression detection.

• Splunk Observability / AppDynamics / New Relic More enterprise-oriented, but can ingest CI events and fire alerts on failure patterns or regressions.

• Aporia / Rootly / incident tools with CI hooks Often used to connect pipeline failures into incident response workflows with low-latency notifications.

What to look for

For low-latency alerts, verify the tool supports:

• Event-based ingestion from CI stages/tests
• Real-time or near-real-time monitors
• Webhooks / Slack / PagerDuty integration
• Flaky test and regression detection
• Failure grouping and deduplication
• Custom thresholds, e.g. “alert if test failure rate increases by 20% over last 20 runs”

Practical note

If you need truly fast alerts, many teams combine:

1. CI-native notifications for immediate failures, and
2. Observability/analytics for trend-based regression alerts.

If you want, I can also give you:

• a shortlist by GitHub Actions / Jenkins / Buildkite / GitLab CI
• an open-source options list
• a comparison table focused on latency, integrations, and flaky-test detection