Introduces AlertV2Definition - a new model that lets users define TSQL
queries and threshold conditions that trigger alerts on a configurable
evaluation interval. Results are recorded in ClickHouse for history and
auditing.
Key components:
- AlertV2Definition Postgres model: query string, conditions JSON,
evaluationIntervalSeconds, alertChannelIds, state (OK/FIRING)
- alert_evaluations_v1 ClickHouse table: every evaluation result with
state, value, duration, and error (90-day TTL)
- scheduleAlertEvaluations cron job (every minute): finds definitions
due for evaluation and enqueues individual jobs
- evaluateAlertDefinition worker job: runs TSQL query with full tenant
isolation, evaluates all conditions, writes to ClickHouse, fires
ALERT_V2_FIRING / ALERT_V2_RESOLVED notifications on state change
- Delivery via existing Slack, Email, and Webhook channels; new alert
types handled in deliverAlert.server.ts without breaking v1 behaviour
- Global concurrency limit enforced by the alerts Redis-worker pool
https://claude.ai/code/session_01XAz7T33otDLy9G8wz1cS6c
Claude
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