Allows alert rules to fire on agent-lifecycle events — REGISTERED,
RE_REGISTERED, DEREGISTERED, WENT_STALE, WENT_DEAD, RECOVERED — rather
than only on current state. Each matching `(agent, eventType, timestamp)`
becomes its own ackable AlertInstance, so outages on distinct agents are
independently routable.
Core:
- New `ConditionKind.AGENT_LIFECYCLE` + `AgentLifecycleCondition` record
(scope, eventTypes, withinSeconds). Compact ctor rejects empty
eventTypes and withinSeconds<1.
- Strict allowlist enum `AgentLifecycleEventType` (six entries matching
the server-emitted types in `AgentRegistrationController` and
`AgentLifecycleMonitor`). Custom agent-emitted event types tracked in
backlog issue #145.
- `AgentEventRepository.findInWindow(env, appSlug, agentId, eventTypes,
from, to, limit)` — new read path ordered `(timestamp ASC, insert_id
ASC)` used by the evaluator. Implemented on
`ClickHouseAgentEventRepository` with tenant + env filter mandatory.
App:
- `AgentLifecycleEvaluator` queries events in the last `withinSeconds`
window and returns `EvalResult.Batch` with one `Firing` per row.
Every Firing carries a canonical `_subjectFingerprint` of
`"<agentId>:<eventType>:<tsMillis>"` in context plus `agent` / `event`
subtrees for Mustache templating.
- `NotificationContextBuilder` gains an `AGENT_LIFECYCLE` branch that
exposes `{{agent.id}}`, `{{agent.app}}`, `{{event.type}}`,
`{{event.timestamp}}`, `{{event.detail}}`.
- Validation is delegated to the record compact ctor + enum at Jackson
deserialization time — matches the existing policy of keeping
controller validators focused on env-scoped / SQL-injection concerns.
Schema:
- V16 migration generalises the V15 per-exchange discriminator on
`alert_instances_open_rule_uq` to prefer `_subjectFingerprint` with a
fallback to the legacy `exchange.id` expression. Scalar kinds still
resolve to `''` and keep one-open-per-rule. Duplicate-key path in
`PostgresAlertInstanceRepository.save` is unchanged — the index is
the deduper.
UI:
- New `AgentLifecycleForm.tsx` wizard form with multi-select chips for
the six allowed event types + `withinSeconds` input. Wired into
`ConditionStep`, `form-state` (validation + defaults: WENT_DEAD,
300 s), and `enums.ts` options. Tests in `enums.test.ts` pin the
new option array.
- `alert-variables.ts` registers `{{agent.app}}`, `{{event.type}}`,
`{{event.timestamp}}`, `{{event.detail}}` leaves for the new kind,
and extends `agent.id`'s availability list to include `AGENT_LIFECYCLE`.
Tests (all passing):
- 5 new JSON-roundtrip cases on `AlertConditionJsonTest` (positive +
empty/zero/unknown-type rejection).
- 5 new evaluator unit tests on `AgentLifecycleEvaluatorTest` (empty
window, multi-agent fingerprint shape, scope forwarding, missing env).
- `NotificationContextBuilderTest` switch now covers the new kind.
- 119 alerting unit tests + 71 UI tests green.
Docs: `.claude/rules/{core,app,ui}` and CLAUDE.md migration list updated.
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