This module will check for MUC messages with XEP-0334 Message Processing Hints tags to qualify those messages as “historic” for later MAM archiving or not.
First copy the module to the prosody plugins directory.
Then add “muc_mam_hints” to your modules_enabled list in your MUC component:
"conference.example.org" "muc"
Component = {
modules_enabled "muc_mam",
"muc_mam_hints",
}
With the plugin installer in Prosody 0.12 you can use:
sudo prosodyctl install --server=https://modules.prosody.im/rocks/ mod_muc_mam_hints
For earlier versions see the documentation for installing 3rd party modules