fix(sdk-metrics): ignore invalid metric values

[legendecas]

Which problem is this PR solving?

Ignore invalid metric values.

Fixes #3985

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• SyncInstruments
• ObservableResult.

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added

[codecov]

Codecov Report

Merging #3988 (af43971) into main (87fff2e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head af43971 differs from pull request most recent head 7065a5c. Consider uploading reports for the commit 7065a5c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3988      +/-   ##
==========================================
+ Coverage   92.34%   92.36%   +0.02%     
==========================================
  Files         321      321              
  Lines        9249     9264      +15     
  Branches     1962     1968       +6     
==========================================
+ Hits         8541     8557      +16     
+ Misses        708      707       -1     

Files Changed	Coverage Δ
packages/sdk-metrics/src/Instruments.ts	95.74% <100.00%> (+0.50%)	⬆️
packages/sdk-metrics/src/ObservableResult.ts	100.00% <100.00%> (+3.57%)	⬆️

[pichlermarc]

Glad to have this fixed. Thank you for taking care of this. 🙂

[JamieDanielson]

Sorry on the delay, just needs a changelog conflict resolved 👍

[dyladan]

looks like the node 8 backtests are failing for some reason but I can't see what that reason is. The tests have unexpected token { but the sources look ok to me. Anyone got any ideas?

[martinkuba]

Looks like it's now failing on other PRs (and main as well). Some dependency must have changed.

[pichlermarc]

looks like the node 8 backtests are failing for some reason but I can't see what that reason is. The tests have unexpected token { but the sources look ok to me. Anyone got any ideas?

@dyladan @martinkuba looks a dependency in istanbul was updated that causes it to not work with Node.js v8 anymore, see #4030