## Summary
Phase 1 of a multi-phase cautious approach for adding an experimental application cache for Kibana solutions called `metric_entities` and integrates it within Security Solutions.
Phase 1 is putting experimental support into the application without breaking existing features. Lots of TODO's, conversations and a possible RFC from phase 1 to phase 2 approach. Some features are missing, but for phase 1 the general idea and code is all there.
To enable this first phase after checking out the branch add this to your `kibana.dev.yml`
```yml
xpack.metricsEntities.enabled: true
xpack.securitySolution.enableExperimental: ['metricsEntitiesEnabled']
```
Then go into Stack Management -> Advanced Settings (Under Security Solutions) and set the enabled to true like so:
<img width="1229" alt="Screen Shot 2021-04-08 at 2 21 02 PM" src="https://user-images.githubusercontent.com/1151048/114091276-b3cbb700-9875-11eb-9083-5c1d91dd20ed.png">
Next go to the security_solutions page and you will see it being activated and you will have these transforms running if you look under stack management:
<img width="1710" alt="Screen Shot 2021-04-29 at 2 00 27 PM" src="https://user-images.githubusercontent.com/1151048/116611174-4a2e4e00-a8f3-11eb-9e15-55cb504dfb2a.png">
On the hosts page, network, page, etc... You can see them being activated when you have no query/filter and you click on request:
<img width="1405" alt="Screen Shot 2021-04-29 at 2 01 28 PM" src="https://user-images.githubusercontent.com/1151048/116611274-6a5e0d00-a8f3-11eb-9998-9f5b3d1c5c63.png">
You will see in the request the index patterns all starting with `estc_xyz*`
### Checklist
Delete any items that are not applicable to this PR.
- [x] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/master/packages/kbn-i18n/README.md)
We have lots of TODO's but no concrete docs with this just yet.
- [ ] [Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html) was added for features that require explanation or tutorials
Behind a feature flag and this isn't there yet.
- [ ] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios
Co-authored-by: Frank Hassanabad <frank.hassanabad@elastic.co>
