Public telemetry contract for Oban Powertools.

Phase 8 freezes five event families under the [:oban_powertools, family, event_suffix] prefix:

• :operator_action
• :limiter
• :cron
• :workflow
• :lifeline

The public measurement key is :count.

Allowed low-cardinality metadata keys per family:

• :operator_action -> [:action, :source]
• :limiter -> [:action, :blocker_code, :resource, :scope]
• :cron -> [:action, :source, :overlap_policy, :catch_up_policy]
• :workflow ->
  • :step_completed -> [:outcome, :terminal_cause, :semantics_version]
  • :step_unblocked -> [:scope, :state, :semantics_version]
  • :cascade_cancelled -> [:scope, :outcome, :terminal_cause, :semantics_version]
  • :workflow_terminal -> [:state, :outcome, :terminal_cause, :semantics_version]
• :lifeline -> [:action, :incident_class, :target_type, :outcome, :archived_count, :pruned_count]

IDs, job args, preview tokens, and free-form reasons are intentionally excluded from this public API.