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Collect metrics about what type of proxies are running (e.g., are they the standalone proxy-go instances, webextensions, web badges, etc.) and add them to the current set of metrics that are displayed.

This requires sending some additional information from the proxies to the broker in the initial poll step and will require whatever we decide to use for backwards compatable changes in the way different peices of snowflake interact with each other (legacy/trac#30704 (moved)).