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Explain DevOps Score Service Ping requirement

Dan Jensen requested to merge djensen-clarify-devops-score-usage-ping-requirement into master

What does this MR do and why?

Users often ask if it is possible to enable DevOps Score without enabling Service Ping. This adds a bit more context in the documentation about why that is not currently possible.

The full story is that to support DevOps Score without Service Ping, we would need to add a table in gitlab to store the data locally, in parallel to version-gitlab-com which stores the data centrally with GitLab. Basically duplicate functionality, which we're not excited to build.

As explained by @pskorupa in Slack#g_product_intelligence on 2021-09-16:

I think this is not possible at the moment, as the Conversational Development Index (which is the basis for the DevOps score) is calculated on version-gitlab-com and sent as a response to sending the Service Ping payload. We can't move the calculation to gitlab-com, because it's based on historical data from the last 35 days, and we don't store past Service Ping payloads in gitlab-com. So yeah, it would take a lot of effort to make this work.

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