condition.signal | string | One of: database.unavailable, backup.archive_failed, storage.capacity, cpu.pressure, memory.pressure, database.pool_saturation, queue.backlog, cpu.percent, memory.used_bytes, memory.limit_bytes, disk.used_bytes, disk.limit_bytes, disk.read_iops, disk.write_iops, network.receive_bytes, network.transmit_bytes, runtime.restarts, runtime.uptime_seconds, http.requests, http.errors, database.connections, database.pool_waiting, database.queries_per_second, database.query_latency_avg_ms, database.query_latency_p50_ms, database.query_latency_p90_ms, database.query_latency_p95_ms, database.query_latency_p99_ms, queue.backlog_messages, queue.oldest_message_age_seconds, cron.failures. |