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Object.wait() requires ownership of that object’s monitor. The thread releases that monitor and enters a waiting state until notification, interruption, timeout, or spurious wakeup; it must reacquire the monitor before returning. Always wait in a while loop that rechecks the condition, and use higher-level concurrency utilities where possible.

Start tracemalloc before the workload, take snapshots at comparable points, and compare line-level allocation differences. It tracks Python-managed allocations, not every native allocation from extensions or system libraries. Correlate it with RSS and object-retention behavior; growing allocation totals do not alone prove a leak if objects are later freed.

Rebuilding separately for staging and production can produce different binaries from the same apparent release. Build once, identify the artifact with its source revision and provenance, then promote that immutable artifact. Caches can accelerate builds, but a cache miss must not change correctness.

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.

HashMap uses hashCode to choose a bucket and equals to identify a key within it. Equal values must share a hash, and hash-relevant state must not change while the object is used as a key. Check equality in both directions, inspect hash values, and prefer immutable key objects.

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.