Add NATS Filebeat dashboard

[ChrsMark]

This PR is part of #10071.

Co-Authored-By: Stamatis Katsaounis katsaouniss@gmail.com
Co-Authored-By: Michael Katsoulis michaelkatsoulis88@gmail.com

[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?

[ChrsMark]

Cc: @skatsaounis , @MichaelKatsoulis , @ruflin

[ChrsMark]

Taking the opportunity to mention here that the importing procedure of Filebeat's dashboards is quite tricky. Actually I was not able to import the dashboards with make import-dashboards as I had done with Metricbeat's in the past.

In order to make it work for me I copied Metricbeat's Makefile approach, so I add the following lines in the Makefile of Filebeat:

# Collects all module dashboards
.PHONY: kibana
kibana:
       @rm -rf _meta/kibana.generated
       @mkdir -p _meta/kibana.generated
       @-cp -pr module/*/_meta/kibana/* _meta/kibana.generated

Then I run:

1. make kibana
2. python ../libbeat/scripts/unpack_dashboards.py --glob="./_meta/kibana.generated/7/dashboard/*.json"
3. make import-dashboards

Is there a more solid way to achieve this? Despite I searched a lot I didn't find anything so I had to dive into the code to tackle this.

[ruflin]

jenkins, test this

[ruflin]

The way I test it is: ./filebeat -E setup.dashboards.directory=./build/kibana/ -e. In Filebeat the generated dashboards are under build/kibana. We plan to unify this moving forward.

[ruflin]

I tested by loading this dashboard and skimming through the JSON. I couldn't test it with real data but looks solid to me.

[skatsaounis]

@ruflin: Hi Nicolas! A quick info: I found out that this PR is not part of 7.x branch. I do not know if it happens for a reason or it was mistakenly not back-ported.

[ruflin]

We do bulk backports to 7.x once a week. Seems like we didn't do one since this got merged, but it will happen soon ;-)