app: instrument not ready reasons

[corverroos]

Instruments not ready reasons for improved UX.
Also fix a "concurrent map write" panic in peerinfo.

category: feature
ticket: #999

[codecov]

Codecov Report

Base: 53.26% // Head: 53.34% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (4f60ab9) compared to base (c2a8f27).
Patch coverage: 45.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1302      +/-   ##
==========================================
+ Coverage   53.26%   53.34%   +0.07%     
==========================================
  Files         140      140              
  Lines       16839    16843       +4     
==========================================
+ Hits         8970     8985      +15     
+ Misses       6593     6587       -6     
+ Partials     1276     1271       -5     

Impacted Files	Coverage Δ
app/metrics.go	83.33% <ø> (ø)
app/peerinfo/peerinfo.go	54.48% <0.00%> (-1.55%)	⬇️
app/monitoringapi.go	76.28% <71.42%> (ø)
core/scheduler/scheduler.go	72.94% <0.00%> (-0.54%)	⬇️
core/priority/prioritiser.go	64.76% <0.00%> (+1.03%)	⬆️
core/leadercast/transport.go	76.33% <0.00%> (+1.18%)	⬆️
app/vmock.go	79.14% <0.00%> (+6.95%)	⬆️

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[xenowits]

LGTM🚀