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This data is collected on shutdown, the same as the legacy analytics data. This is implementation for some of the analytics we want to collect, specified at go/dart-analyzer-plugin-analytics. * How many plugins are enabled for each context? * How many lint rules are registered for each plugin? * How many warning rules are registered for each plugin? * How many fixes are registered for each plugin? * How many assists are registered for each plugin? Change-Id: I36c176737c194550e1947985576ed461fd8a1bf3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/452482 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>