Distributed-systems

How retry budgets keep microservice retries useful without letting clients amplify overload, including per-request limits, client retry ratios, token buckets, retry metadata, and production metrics.

How correlation IDs in microservices connect logs, traces, queues, and background jobs across service boundaries without pretending to replace real tracing or metrics.

A practical OpenTelemetry guide for backend engineers: what to instrument first, how traces, metrics, logs, context propagation, attributes, sampling, and collectors make production debugging clearer.

How to handle webhook idempotency and retries in production with durable receipt records, atomic deduplication, fast acknowledgements, idempotent workers, and replay-safe side effects.

How to build a PostgreSQL job queue with FOR UPDATE SKIP LOCKED, including schema design, atomic claiming, indexes, retries, stuck-job recovery, cleanup, and production trade-offs.