[Docs] The Logging page appears to lack indications for setting Logstash root level logging

[naj-h]

Tell us about the issue

Description:

As Support Engineers, it can happen often that we need to review Debug/Trace level logs when troubleshooting technical issues with Logstash. Sometimes, we would like to have a look at the root level Debug logs before going further to either set only specific loggers or actually finding the root cause of the issue being investigated.

My feedback here is about the Logging page:

• This page does not mention the log.level setting of logstash.yml method which is sometimes the quickest/clearest way for customers to set global logging to Debug level. Unless there are reasons not to use it, it would make sense to have it listed as part of the ways we can increase logging level. The Logging page only mentions the API and log4j2.properties methods

You can configure logging using the log4j2.properties file or the Logstash API.

• AFAICT, even for the API and log4j2.properties methods, the page also does not include a clear example on how to set root level logging.

URL:

https://www.elastic.co/guide/en/logstash/current/logging.html

Anything else?

[rehanpfmr]

@naj-h Hi, Can I get this assigned?