ENGINEERING

Page on-call and lock the release branch on critical fast burn

When Honeycomb signals a critical fast-burn event, pages the on-call engineer via PagerDuty and enables branch protection that blocks merges to the release branch until budget…

CategoryEngineering
Enginesim
Difficultyadvanced
Triggerwebhook
Steps5
Setup~25 min

How it runs

The automated pipeline, trigger to output.

  • TriggerHoneycomb critical fast-burn alert webhookHoneycomb
  • LogicConfirm alert is critical tier, not a warning
  • ActionTrigger PagerDuty incident for on-call rotationPagerDutyPagerDuty
  • ActionLock release branch via GitHub branch protectionGitHubGitHub
  • OutputPost branch-lock and page notice to SlackSlack

What it does

Handles the worst-case burn: a critical fast-burn alert that means the budget will be exhausted within hours. It escalates to the on-call engineer and hard-locks the release branch so no further merges can compound the incident.

When to use it

Reserve this for your tightest, highest-severity SLOs where continuing to ship during a fast burn is unacceptable. It is the enforcement-with-teeth counterpart to softer label-based freezes.

How it works

  1. 1A Honeycomb critical fast-burn alert webhook fires.
  2. 2A logic step confirms the alert is the critical tier and not a lower-severity warning; warnings exit early.
  3. 3The flow triggers a PagerDuty incident for the owning service's on-call rotation with the SLO and burn rate.
  4. 4It updates GitHub branch protection on the release branch to require an admin override, effectively blocking merges.
  5. 5It posts a Slack alert stating the branch is locked, who was paged, and the conditions to unlock.

Set it up

What you configure once, before turning it on.

  1. 1
    Connect HoneycombDistributed traces and queries.
  2. 2
    Connect PagerDutyIncidents, on-call, escalations.
  3. 3
    Connect GitHubRepos, issues, pull requests, actions.
  4. 4
    Connect SlackChannels, DMs, threads, mentions.
  5. 5
    Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
  6. 6
    Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
  7. 7
    Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.

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