fix(chart value): fixing interval from 60 to 30 as it's the default

[cristian98149]

Motivation

From docs, default interval values is 30 but on chart values 60 is set.

[samuel-esp]

Oh we didn't noticed that, thanks for pointing it out. I think it would be better to change the default time to 60' inside the documentation. I don't see a strong reason to set the interval at 30' as the new default inside the deployment. I'll wait also for @jonathan-mayer @JTaeuber @Fovty opinions

[cristian98149]

What's the interval used for?

It could impact time needed for scaling down workloads? I'm noticing that if workloads to scale are too much (almost 600) it takes long time to scale them.

Thank you

[JTaeuber]

@samuel-esp I agree. It is probably better to just change the docs to the correct value.

@cristian98149 The interval is the time in between scans of the py-kube-downscaler. Meaning that every minute the py-kube-downscaler looks for workloads with the appropriate annotations and then scales them. If needed you can change the interval to 30 seconds in a custom values file afterwards.

[jonathan-mayer]

Closing this since it is going to be implemented in #112