prometheus: make backend configurable for now admin users about plugins HOT 10 OPEN

@yolossn I updated the issue.

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I am running into this too. My cluster already has a Prometheus server installed, I don't want to deploy another one.

In addition, the message is not very clear: "Install Prometheus for accessing metrics charts" Does this mean installing a Prometheus server or the Prometheus plugin for Headlamp?

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In addition, note that Prometheus might be using HTTPS.

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I am running headlamp as a web app for my cluster's users, in my case they don't need to configure this value, I would do it when installing. For example an environment variable would be perfect.

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Hey @farodin91 Can you explain a bit more on this? Do you want a way to specify the proxy URL for accessing prometheus?

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Hey @remram44 We are working on plugin settings feature which will allow plugins to make certain values configurable by the end user. The PR is under review now, once that is done, we will update the prometheus plugin to allow the user configure the endpoint to access prometheus.

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We are running VictoriaMetrics as an drop-in replacement for Prometheus.

It would be very helpful if we would be able to set a custom endpoint in Prometheus plugin.

example

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This can be solved in two different ways, the user can either provide the label to identify the prometheus pod and the plugin figures out how to reach the pod etc or the user can provide the namespace and pod/service url to reach the prometheus pod.

If we choose to solve it by getting the namespace and pod/service url from the user, the following steps can be used to fix this.

1. Create a Settings component and register it using the registerPluginSettings function.
   The Settings component should take care of getting the namespace and service to access prometheus as inputs and store it in plugin conf.

2. In the components that use fetchMetrics get the config using the ConfigStore and generate the prefix and pass it to the fetchMetrics function.

References:

1. Introduction to Plugin Settings
2. OpenCost plugin for headlamp has a similar configuration mechanism.

cc: @joaquimrocha

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@skoeva Can you look into this one?

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This can be solved in two different ways

Maybe we can leave a space for multiple solutions, if they will be implemented later

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