add percona support to filebeat-module-mysql-slowlog

[HagK]

added grok pattern for percona slowlogs, includes optional InnoDB statistics
see #6665

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[elasticcla]

Hi @HagK, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in yout Git commit. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile?

[jsoriano]

@HagK thanks for your help here!

I have opened another PR to merge both patterns and support the example file you provided, find it here #10227, I have added you as co-author.

Let me know what you think.

[HagK]

@jsoriano the new PR it's fine for me. But as i understand, the gsub-pattern for Time must be extended too, because percona use the ISO 8601 timeformat with alnum characters. As i remember, i had some errors before i changed it.

[jsoriano]

@HagK good point, I think this would have been needed before, but not after this change that removes also the lines starting with # Time.

Actually I am going to remove this part of the pipeline.

[jsoriano]

#10227 merged, closing this.