## Summary
The `mollifier.decisions` metric only carried an `outcome` label, so for
an org that has the mollifier enabled there was no way to see how often
its triggers pass through the gate instead of being diverted — making it
hard to tell why the trip isn't firing for an opted-in org.
This adds two bounded labels: `enrolled` (`"true"`/`"false"`, the
per-org flag) and `org` (the org id, attached **only** when `enrolled`
is true). For an enrolled org you can now compare directly:
`mollifier.decisions{outcome="pass_through", enrolled="true",
org="<id>"}` vs `{outcome="mollify", ...}`.
## Design
`recordDecision` now takes an options object (`{ reason?, enrolled,
orgId? }`). The `org` label is restricted to the enrolled cohort to keep
cardinality bounded — the guard lives in a pure `decisionLabels` helper,
so a non-enrolled org id can never be attached even if one is passed.
The enrolled set is small and capped operationally.
The per-org flag is resolved once at the top of `evaluateGate`
(in-memory, no DB round-trip on the trigger hot path) so every decision
— including the debounce / one-time-use-token / triggerAndWait bypasses
— is labelled consistently.
## Test plan
- [x] `mollifierGate.test.ts` cascade asserts `enrolled`/`org` on every
gate branch
- [x] `mollifierDecisionLabels.test.ts` (new) proves `org` is dropped
for non-enrolled even when an id is passed (cardinality guard)
- [x] `vitest run mollifierGate mollifierDecisionLabels` — 34/34 pass
- [x] `pnpm run typecheck --filter webapp` clean
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Daniel Sutton
d7028e278e