feat: add doc for telemetry and usage data #4619
Merged
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What does this PR do?
The telemetry investigation in #3788 led to a couple issues being opened to improve the events we're sending, but one of the comments was that we don't really have this written down anywhere.
Some other projects contain a USAGE_DATA.md file, so this is my attempt to both write down what we collect and why for users, but also start some coding notes for committers. Feedback appreciated.
Screenshot/screencast of this PR
N/A
What issues does this PR fix or reference?
Fixes #3788.
How to test this PR?
N/A