Cache OTel instruments appear defined but not registered via registerInstruments

[joyita07]

Hi,

I’m using groupcache-go with a custom OpenTelemetry MeterProvider.

I can see group-level metrics being exported successfully (gets, hits, loads, peer loads, etc.), which suggests the instrumentation registration path (registerInstruments) is working and being invoked during instance initialization.

However, I’m not seeing any cache-level metrics exported, even though:

• stats.go defines cacheInstruments via newCacheInstruments
• Cache-level stats like Rejected, Bytes, Items, Hits, Evictions are available via Cache.Stats()
• The README explicitly suggests monitoring cache stats such as Cache.Stats().Rejected

This suggests that cache-level instrumentation exists but may not be wired into the registration path (e.g. via registerInstruments).

Is this omission intentional? If not, should newCacheInstruments be invoked as part of registerInstruments so cache-level stats (including evictions and rejected entries) are observable via OTel?