cre-5198: cache metrics via metrics endpoint

[mchain0]

extension to wire via /metrics endpoint

cre-5198

[github-actions]

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[github-actions]

⚠️ API Diff Results - github.com/smartcontractkit/chainlink-common

⚠️ Breaking Changes (1)

pkg/diskmonitor (1)

• NewDiskMonitor — Type changed:

func(
  github.com/smartcontractkit/chainlink-common/pkg/logger.Logger, 
  string, 
  string, 
  time.Duration, 
  + ...Option
)
(*DiskMonitor, error)

✅ Compatible Changes (2)

pkg/diskmonitor (2)

• Option — ➕ Added

• WithPrometheusGauge — ➕ Added

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