[spanmetrics] Do not drop metric data points on attributes cache miss.

[kovrus]

Description:

Components:

• spanmetrics connector
• spanmetrics processor

The metric key to attributes cache should improve performance but should result in data loss when on cache misses. This change addresses the issue with dropped data points.

At this point, the core logic of the components is the same, so it should be fine to fix this issue for both components in the same PR.

Testing:
Existing unit tests

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test duration(44 minutes 27 seconds) has decreased 22 minutes 16 seconds compared to main branch avg(1 hour 6 minutes 43 seconds).

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⭕  build-and-test-windows workflow has finished in 4 seconds (41 minutes 37 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

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✅  check-links workflow has finished in 52 seconds (1 minute 39 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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✅  telemetrygen workflow has finished in 1 minute 1 second (2 minutes 3 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 39 seconds (5 minutes 12 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  load-tests workflow has finished in 13 minutes 57 seconds (2 minutes 53 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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Job	Failed Steps	Tests
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
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✅  build-and-test workflow has finished in 44 minutes 27 seconds (22 minutes 16 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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unittest-matrix (1.19, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1509  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, processor)	-     🔗	✅ 1509  ❌ 0  ⏭ 0    🔗	See Details
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integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, other)	-     🔗	✅ 4745  ❌ 0  ⏭ 0    🔗	See Details
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✅  e2e-tests workflow has finished in 11 minutes 10 seconds (4 minutes 35 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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Job	Failed Steps	Tests
kubernetes-test	-     🔗	N/A	See Details

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[kovrus]

cc: owner - @albertteoh

[albertteoh]

👍🏼

[kovrus]

cc: @Cluas

[Cluas]

LGTM, nice job!