Small fix in ECK Helm config docs

[kilfoyle]

According to issue #2089, the Helm ca-cert-validity setting documented on the Apply ECK configuration settings page should rather be caValidity. This also adds a tip for generating the list of valid settings.

I'm not familiar with these settings at all so I'd appreciate if anyone can confirm that this change is correct.

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[github-actions]

🔍 Preview links for changed docs

• deploy-manage/deploy/cloud-on-k8s/configure-eck.md

[eedugon]

This is interesting @kilfoyle !

This is actually a bug caused by me, let me explain.

I thought the helm chart passes directly everything inside config as configuration parameters to ECK, and in ECK, the theoretical configuration parameter to configure that is ca-cert-validity.

That's documented here.

The problem is that the helm chart is using its own configuration parameters instead of directly relying on the actual ECK parameters (this shows how caValidity is added to the actual ca-cert-validity setting).

To solve this we need to change a bit the narrative, because I wanted to tell users (on purpose) that they can configure ANY ECK setting documented in the ECK reference doc using the helm chart under the config section of the values...

And that's definitely incorrect now that I see the chart, sorry!

Let me share some small suggestions to address this change in a different way. For example, what you have added as a TIP should moved more to the beginning of the section, and probably we should add a note saying that the Helm chart does NOT use the standard configuration parameters documented in (LINK TO REFERENCE), and suggest to use the helm show values command to see the list of configurable settings (which should be aligned with the official config settings but with different syntax).

cc: @elastic/cloud-k8s , just in case you want to add anything here.

[eedugon]

I'm approving, but to avoid future misunderstandings I think we have to update a bit the introduction of that section, as my current original intro would cause confusion if we don't explain that the helm chart uses its own settings for the ECK configuration flags (they are not just passed through).

[kilfoyle]

Thanks a lot @eedugon for explaining! I've updated the section so that we can explain at the top of the Helm section about the Helm settings being different from the ECK settings. I assume that Option 2, using the --set command, should similarly use the Helm version rather than the ECK version of the parameter. I've updated the PR changes as shown below.

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[eedugon]

beautiful!!!!! Many thanks for this!

[eedugon]

good catch :)