[Story] Draupnir new version notification protection.

[Gnuxie]

Description

⚠️ This is WIP and I am taking advice on the feasibility of this issue in regards to privacy. We are not going to do this. Please shout if you have concerns however. ⚠️

• As a Draupnir bot mode moderator or an Appservice mode system admin, I want to know when a new version of Draupnir is available.
• As a Draupnir developer I want to be able to see the number of Draupnir deployments running each version.

Acceptance Criteria

• A new protection is enabled by default, the NewVersionNotficiationProtection.
  • This can be turned off in the config, similar to the ServerBanSynchronisationProtection, to avoid it being enabled when starting Draupnir for the first time.
  • The protection sends a request to a configured endpoint with the current version.
  • A request is sent every hour to fetch the new version from the endpoint.
• A tool exists to receive the request, applies a bloom filter to the sender to remove duplicates.
  • The tool keeps a total number of Draupnir running on each version number.
  • When a request passes through the filter, the related version number total is incremented. No information about the request is persisted.
  • Every hour the tool dumps the total number of Draupnir to a log, which is rotated and aggregated to a weekly average.

Issues

• Automatic version checking Draupnir#236

[Gnuxie]

It might be possible to make this opt in, by sending a message when the protection starts asking for consent and informing them of everything.