Add reporting of lag as a metric

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 13.72549% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 48.87%. Comparing base (891815f) to head (be18e6a).

❗ Current head be18e6a differs from pull request most recent head 5e8aeaf. Consider uploading reports for the commit 5e8aeaf to get more accurate results

Files	Patch %	Lines
daemon.go	0.00%	27 Missing ⚠️
indexers/contacts.go	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   52.15%   48.87%   -3.29%     
==========================================
  Files           6        6              
  Lines         533      579      +46     
==========================================
+ Hits          278      283       +5     
- Misses        230      271      +41     
  Partials       25       25              

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