x/telemetry/config: collect gopls/telemetryprompt/accepted #68770
Description
Summary
From gopls, we ask a select fraction of users to enable telemetry via an LSP prompt (a showMessageRequest dialog). Starting in gopls@v0.16.1, we record a gopls/telemetryprompt/accepted counter when users accept the prompt.
By collecting this counter, we can estimate the fraction of new telemetry participants that are coming from the prompt, which will help us evaluate the efficacy of the prompt itself.
Of course, we cannot know how many users decline the prompt.