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Use bounded connection pools, semaphores or worker queues, request deadlines, and deliberate overload responses. Local limits must account for replica count because each replica has its own pool. Avoid unbounded in-memory tasks and retries that amplify load during an incident.

Capture narrowly at the client and, if possible, server. A SYN leaving without a reply suggests routing or filtering; a reset indicates an active rejection or no listener; a completed handshake moves investigation toward TLS or the application protocol. Packet captures can expose sensitive metadata or payloads, so limit capture scope and protect files.

Unlike TCP, UDP does not establish a transport connection before sending a datagram. A missing response can mean filtering, packet loss, an invalid request, or an application that does not reply. Use a valid protocol-level health check and capture at sender and receiver when diagnosing the path.

Enable and inspect unified GC logs for pause duration, cause, heap before/after, promotion, and allocation behavior. Correlate with request latency and container memory. A large live set, allocation bursts, humongous objects, or memory pressure can imply different fixes; tune collector flags only after identifying which resource or workload pattern drives the pauses.

It narrows the investigation but does not identify one root cause: route failure, filtering, destination outage, asymmetric routing, or capture at the wrong interface can all look similar. Capture at both ends, check socket listeners and network policy, and correlate with route and firewall telemetry.