Investigate reason for zero values in SPM metrics

[FlamingSaint]

Which problem is this PR solving?

• Part of [jaeger v2] Service Performance Monitoring #5632

Description of the changes

• Added changes to the spm script to detect zero values occurring in the middle

How was this change tested?

• make dev-v2

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[yurishkuro]

nit:

Suggested change

	local flag=false # Becomes true after first non-zero value
	local non_zero_found=false

[yurishkuro]

We already know that this causes failures, what are you trying to achieve with this change? How does it help with debugging?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.79%. Comparing base (2c4aa39) to head (b49d05e).
Report is 162 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5853      +/-   ##
==========================================
+ Coverage   96.66%   96.79%   +0.13%     
==========================================
  Files         342      342              
  Lines       16521    16522       +1     
==========================================
+ Hits        15970    15993      +23     
+ Misses        362      341      -21     
+ Partials      189      188       -1     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.81% <ø> (-0.01%)	⬇️
cassandra-3.x-v1	16.61% <ø> (ø)
cassandra-3.x-v2	1.74% <ø> (-0.01%)	⬇️
cassandra-4.x-v1	16.61% <ø> (ø)
cassandra-4.x-v2	1.74% <ø> (-0.01%)	⬇️
elasticsearch-6.x-v1	18.78% <ø> (ø)
elasticsearch-7.x-v1	18.84% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v1	19.02% <ø> (ø)
elasticsearch-8.x-v2	1.80% <ø> (-0.02%)	⬇️
grpc_v1	9.52% <ø> (ø)
grpc_v2	7.14% <ø> (-0.01%)	⬇️
kafka-v1	9.74% <ø> (ø)
kafka-v2	1.81% <ø> (-0.01%)	⬇️
memory_v2	1.81% <ø> (-0.01%)	⬇️
opensearch-1.x-v1	18.89% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.88% <ø> (-0.02%)	⬇️
opensearch-2.x-v2	1.80% <ø> (-0.02%)	⬇️
unittests	95.27% <ø> (+0.18%)	⬆️

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[FlamingSaint]

We already know that this causes failures, what are you trying to achieve with this change? How does it help with debugging?

I created this PR mainly to keep track of the changes and the discussion on how to solve this problem.