fix: reduce dht logging and update metrics

[achingbrain]

Make some more verbose logging trace logging and switch metrics to use separate operation/error metrics.

Refs: https://promlabs.com/blog/2023/09/19/errors-successes-totals-which-metrics-should-i-expose-to-prometheus/

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works