feat(v2:metrics): implement histograms on services - #1777
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- Add ReceiverMetrics with per-method LatencyHistograms for reset, updateSlotRange, and processPacket - Add ResultLatencyHistogram to telemetry lib, which flattens an `Error!Payload` into one series per outcome via `variant` labels - Wire metrics through Receiver.init and observe timings around each method, exposing outcome-tagged series for processPacket - Add Grafana dashboard for the shred receiver - Make error sets explicit on shred parsing, merkle root computation, and ed25519 signature verification so processPacket's error set is nameable
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Intent
TODO
Implementation
TODO
Ramifications
Tests
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