Update diagnostic tool to capture and register these metrics. Update also the html generated in the snapshot.

[robbavey]

Update the tools used to create and analyse diagnostic snapshots:

• sdh-logstash repository comment analyser: https://github.com/elastic/sdh-logstash
• support analyser tool in https://github.com/elastic/support
• diagnostic tool https://github.com/elastic/support-diagnostics

Batch structure metrics: average and lifetime

• Update the sdh-logstash https://github.com/elastic/sdh-logstash/pull/1758
• Update the support analyser tools (full and plain versions) https://github.com/elastic/support/pull/767

Batch structure metrics: p50, p90 for 1m, 5m and 15m

• Update the sdh-logstash to display such information https://github.com/elastic/sdh-logstash/pull/1760

• Update the support analyser tools (full and plain versions) to display such flow information. Consider to avoid adding many columns and prefer solution like (https://github.com/elastic/support/pull/768):

    | byte size p90       	| byte size p50      	| event count p90     	| event count p50    	|
    |---------------------	|---------------------	|---------------------	|---------------------	|
    | X 1m / Y 5m / Z 15m 	| X 1m / Y 5m / Z 15m 	| X 1m / Y 5m / Z 15m 	| X 1m / Y 5m / Z 15m 	|
  

• Update the support-diagnostic tool to include such flow data into the generated HTML report. Updates the flow metrics view in Logstash's diagnostic creation support-diagnostics#978

[andsel]

All sub tasks were completed