feat(alerting): add p99 latency and host memory alerts, db pool panel - #36
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- HighLatencyP99: p99 above 2s for 5m per (job, project, env), with a traffic floor - HostMemoryHigh: MemAvailable-based usage above 90% for 15m - Service Health: DB connection pool panel from the SQLAlchemy instrumentation
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Adds the latency and memory alerts and a connection-pool panel that the relab spoke asked for in CMLPlatform/relab#351. Pool metrics come from the OpenTelemetry SQLAlchemy instrumentation spokes already export, so no new exporter is needed.