Placeholder task since there doesn't appear to be one yet.
Stuff that comes to mind:
- MediaWiki PSR/Monolog logs go to Logstash under type:mediawiki. This is for exception, fatals, and various diagnostic channels.
- MediaWiki logs go to mwlog1001 files. (Test plan: XWD api.php queries go only to api.log; fatal-error.php hits go to both Logstash and mwlog.)
- php-wmerrors fatal errors go from /etc/php/php7-fatal-error.php to Logstash under type:mediawiki channel:exception caught_by:php-wmerrors.
- php-fpm stderr go to Logstash under type:syslog program:php7.2-fpm.