fix(core): warn about missing metrics only once

[Malinskiy]

No description provided.

[codecov]

Codecov Report

Merging #833 (a4acd84) into develop (d6cab46) will decrease coverage by 0.04%.
Report is 3 commits behind head on develop.
The diff coverage is 25.00%.

❗ Current head a4acd84 differs from pull request most recent head 9c797fe. Consider uploading reports for the commit 9c797fe to get more accurate results

@@              Coverage Diff              @@
##             develop     #833      +/-   ##
=============================================
- Coverage      59.62%   59.58%   -0.04%     
  Complexity       799      799              
=============================================
  Files            213      213              
  Lines           4384     4390       +6     
  Branches         690      692       +2     
=============================================
+ Hits            2614     2616       +2     
- Misses          1445     1449       +4     
  Partials         325      325              

Files Changed	Coverage Δ
...marathon/analytics/external/MetricsProviderImpl.kt	54.16% <25.00%> (-2.98%)	⬇️

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