Synapse trusted_key_servers: which ones?

Recent Synapse versions have been advertising the trusted_key_servers setting:

Synapse requires that a list of trusted key servers are specified in order to
provide signing keys for other servers in the federation.

This homeserver does not have a trusted key server configured in
homeserver.yaml and will fall back to the default of ‘’.

Trusted key servers should be long-lived and stable which makes a
good choice for many admins, but some admins may wish to choose another. To
suppress this warning, the admin should set ‘trusted_key_servers’ in
homeserver.yaml to their desired key server and ‘suppress_key_server_warning’
to ‘true’.

In a future release the software-defined default will be removed entirely and
the trusted key server will be defined exclusively by the value of

Since Librehosters may want to trust the same key servers, I was wondering whether everyone is using the default ( or something else.

I am actually using and as trusted key server.

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Just learned that is considered, to matrix, what gmail to mail. May be an unfair comparison but it does keep more metadata than privacy concerned hosters would like to.
Do we take privacy as a concern or only free software? Maybe an item for next meeting?

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