Telemetry events emitted by Magpie's HTTP layer.
Every logical Dropbox request emits:
[:magpie, :request, :start][:magpie, :request, :stop][:magpie, :request, :exception]when the request raises[:magpie, :request, :retry]before an automatic retry[:magpie, :transfer, :progress]while bytes are uploaded/downloaded
Request metadata includes :method, :endpoint and :operation. Stop
metadata also includes :status and Dropbox's :request_id when present.
Measurements use native monotonic time and can be converted with
System.convert_time_unit/3. Transfer measurements contain :transferred
and :total, while metadata identifies the :direction and Dropbox :path.