add additional logging context (#482)

[0xERR0R]

closes #482

[codecov]

Codecov Report

Merging #516 (e55bca4) into development (f2d5b56) will decrease coverage by 0.04%.
The diff coverage is 92.72%.

@@               Coverage Diff               @@
##           development     #516      +/-   ##
===============================================
- Coverage        93.80%   93.75%   -0.05%     
===============================================
  Files               36       36              
  Lines             3082     3090       +8     
===============================================
+ Hits              2891     2897       +6     
- Misses             143      144       +1     
- Partials            48       49       +1     

Impacted Files	Coverage Δ
config/config.go	98.13% <ø> (ø)
server/server.go	84.94% <0.00%> (ø)
resolver/upstream_resolver.go	92.08% <75.00%> (ø)
lists/list_cache.go	98.70% <94.73%> (-1.30%)	⬇️
resolver/blocking_resolver.go	98.49% <100.00%> (+0.01%)	⬆️

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