- Implement computeCounterDelta for Counter32/Counter64 with wraparound handling
- Sanity threshold discards deltas > 90% of max value (device reset detection)
- CounterCache uses Redis MGET/MSET pipelining for efficient state persistence
- Counter keys use "snmp:counter:{device_id}:{oid}" format with 600s TTL
- Add SNMPMetricsEvent and SNMPMetricEntry structs to bus package
- Add PublishSNMPMetrics publishing to "device.metrics.snmp_custom.{device_id}"
- Full test coverage: 10 counter tests including miniredis integration
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
0697563a13