The default for Javascript reporting is that Sentry sets the IP
address of the user to the IP address that the report was observed to
come from[^1]. Since all reports come through the Zulip server, this
results in all reports being "from" one IP address, thus undercounting
the number of affected unauthenticated users, and making it difficult
to correlate Sentry reports with server logs.
Consume the Sentry Envelope format[^2] to inject the submitting
client's observed IP address, when possible. This ensures that Sentry
reports contain the same IP address that Zulip's server logs do.
[^1]: https://docs.sentry.io/platforms/python/guides/logging/enriching-events/identify-user/
[^2]: https://develop.sentry.dev/sdk/envelopes/
Some well-intentioned adblockers also block Sentry client-side error
reporting. Provide an endpoint on the Zulip server which forwards to
the Sentry server, so that these requests are not blocked.
Alex Vandiver