decentraland / deployments-to-sqs / 31912571464

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perf: bound metric cardinality and expose download queue depth (#535)

Observability for the performance program. No throughput change.

`entityType` labels nine counters but arrives from remote content servers,
and @dcl/schemas validates it only as `{ type: 'string' }`. prom-client
never evicts label sets, so every distinct value was permanent: measured at
143 B/series, so 50k values means 61 MB of heap and a 622 ms /metrics
scrape — which is synchronous, so it stalls the event loop and with it the
download queue. Now clamped to EntityType from the schema; anything else
becomes `other`. Log fields keep the raw value.

Adds download_queue_size / download_queue_pending. IJobQueue exposes no
accessor for either, so the transitions are counted in the deployer.

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