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mod_ping_muc: Yet another attempt to improve MUC reliability This time by moving XEP-0410 to the server. Will this save the users from the s2s timeouts? What horrifying unintentional side-effects will this have? Tune in next week to find out!

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.