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Why this exists The health checker script introduced goroutines and channels. Real tools also need shared state (a cache, a results map), coordinated failure (stop everything when one part fails), throttling (do not…
Concurrency Patterns: Mutexes, errgroup, Rate Limiting and a Scheduled Job Runner
The patterns beyond basic goroutines: protecting shared data with mutexes, fan-out with errgroup and a limit, rate limiting requests, and a job runner that ticks on a schedule, skips overlapping runs and stops cleanly. Includes how to find data races.
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