[wip] Blog article on "Demystifying activator on path"

[skonto]

• Introduces a new article on how Knative Pod Autoscaler decides when to add Activator on path and dives into certain concepts of how autoscaling works.
• Adds an example of a scaled service and follows the steps done from the autoscaler in order to deal with the traffic demand.
• It is a common user question as to when a ksvc is in proxy mode and when it goes to serve mode. I think we need to clarify certain stuff for better adoption and this is a starting article.

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[ReToCode]

/cc @rhuss

[skonto]

Thanks for the review guys. This is still in draft mode, I will ping you for the second round as I need to adjust the content a bit, some important stuff are still missing.

[github-actions[bot]]

This Pull Request is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen with /reopen. Mark as fresh by adding the comment /remove-lifecycle stale.

[rhuss]

/remove-lifecycle stale

@skonto what is the status of your blog post? Are you still up for publishing it? That would be great as I think this is a very important topic that many people would be interested in.

[skonto]

@skonto what is the status of your blog post? Are you still up for publishing it?

@rhuss I talked with @dprotaso I will try to publish it this week.

[skonto]

It might even be good to add some more generic info about the activator to the intro (like why it's needed for scale to zero), or maybe link out to the overview in the serving repo

Added a link to the docs we have.

[skonto]

@psschwei @ReToCode @rhuss @dprotaso pls review so we can merge it. It will be nice to have this in as it includes a few stuff that recently some users have asked about.

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[APPROVALNOTIFIER] This PR is APPROVED

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[psschwei]

I'm taking a look now

[skonto]

@psschwei thanks for the comments I will unhold so @dprotaso can reference the blog post for his Kubecon talk and then I will polish it in a follow up PR shortly.

/unhold