rm-hull / dot-block / 26725516311

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feat: implement asynchronous telemetry workers (#126)

* feat: implement asynchronous telemetry workers

Introduced a worker pool pattern for telemetry recording to prevent
blocking the main request path.

- Added `telemetryCh` and `NUM_WORKERS` to `DNSDispatcher`.
- Replaced direct goroutine spawning per request with a buffered channel
  and worker pool.
- Added `dns_dropped_telemetry_total` metric to monitor channel
overflows.
- Standardized log field keys to snake_case.

* refactor: improve channel naming and lifecycle management

- Rename `update` to `updateCh` in `DNSCache` for clarity.
- Define `TELEMETRY_BUFFER_SIZE` constant.
- Add `done` channel to `DNSDispatcher` to ensure proper shutdown
  of the telemetry worker and prevent goroutine leaks.

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