allow independent installation of grafana and prometheus

[dewnull]

This PR allows installing Grafana without installing Prometheus.
This is useful if you are already have a Prometheus installation, but you want to use this chart to install Grafana with Seldon dashboards.

To install just Grafana or just Prometheus, you can set .enabled to false.

[seldondev]

Hi @dewnull. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[axsaucedo]

@dewnull that the chart works is by referencing dependencies, right now you are removing some configuration but prometheus and grafana would still always be installed, you would just not override the components. It would be useful to add this functionality, but it would be good if you can test it locally with flags for grafana, and then prometheus separately to confirm it all works

[axsaucedo]

@dewnull any updates?

[axsaucedo]

Just following up on this one @dewnull any updates?

[ukclivecox]

/test integration

[ukclivecox]

/ok-to-test

[ukclivecox]

/approve

[seldondev]

Thu Aug 27 10:07:46 UTC 2020
The logs for [integration] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2057/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2057 --build=1

[seldondev]

Thu Aug 27 10:07:49 UTC 2020
The logs for [pr-build] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2057/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2057 --build=2

[seldondev]

Thu Aug 27 10:07:53 UTC 2020
The logs for [lint] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2057/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2057 --build=3

[seldondev]

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