Add Server Side batching for UI Metric Collectors

[LDrago27]

Description

This PR introduces Server Side batching of UI metric reports sent by clients to reduce the number of updates taking place at OpenSearch.

Issues Resolved

#6375

Testing the changes

• Enable UI Metric Collector by setting the usageCollection.uiMetric.enabled to true
• Ascertain the ui_metric in usage section is empty when you call the /api/stats?extended=true&legacy=true&exclude_usage=false
• Make a POST call to the /api/ui_metric/report with the following request body {"report":{"reportVersion":1,"uiStatsMetrics":{"console-count-GET_cat.indices":{"key":"console-count-GET_cat.indices","appName":"console","eventName":"GET_cat.indices","type":"count","stats":{"min":0,"max":1,"avg":0.5,"sum":21}}}}}
• Call /api/stats?extended=true&legacy=true&exclude_usage=false and verify that it has an entry {"key":"GET_cat.indices","value":21}
• Make a POST call to the /api/ui_metric/report with the following request body {"report":{"reportVersion":1,"uiStatsMetrics":{"console-count-GET_cat.indices":{"key":"console-count-GET_cat.indices","appName":"console","eventName":"GET_cat.indices","type":"count","stats":{"min":0,"max":1,"avg":0.5,"sum":21}}}}}
• Call /api/stats?extended=true&legacy=true&exclude_usage=false and verify that it has an entry {"key":"GET_cat.indices","value":21} the count shouldn't have been updated
• Wait for a period of 60s. And Make a POST call to the /api/ui_metric/report with the following request body {"report":{"reportVersion":1,"uiStatsMetrics":{"console-count-GET_cat.indices":{"key":"console-count-GET_cat.indices","appName":"console","eventName":"GET_cat.indices","type":"count","stats":{"min":0,"max":1,"avg":0.5,"sum":21}}}}}
• • Call /api/stats?extended=true&legacy=true&exclude_usage=false and verify that it has an entry {"key":"GET_cat.indices","value":63} the count should be updated to the latest value

OR

You can pull in changes opensearch-project/opensearch-dashboards-functional-test#1267 update the flag "UIMETRIC_ENABLED": true and run the following command yarn cypress run --spec cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/telemetry/server.spec.js . This test automates the above mentioned steps.

Changelog

• feat: Add Server Side Batching for UI Metric Colector

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.57%. Comparing base (5258d83) to head (ce56129).
Report is 26 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6721      +/-   ##
==========================================
- Coverage   67.72%   67.57%   -0.15%     
==========================================
  Files        3415     3428      +13     
  Lines       66886    67343     +457     
  Branches    10884    10996     +112     
==========================================
+ Hits        45297    45508     +211     
- Misses      18943    19165     +222     
- Partials     2646     2670      +24     

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