Upgrade to Prosody 0.11.0:

* featuring Lua 5.2
* installing luaevent, luadbi, luadbi-sqlite3 using luarocks (omitting mysql & postgres to keep build small)
* enabling new modules: vcard4, csi_simple, carbons, mam & muc_mam

conf.d/01-modules.cfg.lua

@@ -9,12 +9,13 @@ modules_enabled = {
     "disco"; -- Service discovery
 
     -- Not essential, but recommended
-    "blocklist"; -- simple modern protocol for blocking remote JIDs (XEP-0191)
+    "blocklist"; -- Simple modern protocol for blocking remote JIDs (XEP-0191)
     "private"; -- Private XML storage (for room bookmarks, etc.)
-    "vcard"; -- Allow users to set vCards
-
-    -- These are commented by default as they have a performance impact
-    --"compression"; -- Stream compression (Debian: requires lua-zlib module to work)
+    "vcard4"; -- Allow users to set vCards
+    "vcard_legacy"; -- Support older clients
+    "mam"; -- Message Archive (XEP-0313)
+    "carbons"; -- Share and sync conversations (XEP-0280)
+    "csi_simple"; -- Buffer unimportant traffic for simple optimisation for clients using state indication
 
     -- Nice to have
     "version"; -- Replies to server version requests

conf.d/02-storage.cfg.lua

@@ -14,3 +14,4 @@ storage = {
 
 -- https://modules.prosody.im/mod_mam.html
 archive_expires_after = "1y"
+

conf.d/04-vhost.cfg.lua

@@ -21,4 +21,7 @@ Component ("muc." .. domain) "muc"
 	name = "Prosody Chatrooms"
 	restrict_room_creation = false
 	max_history_messages = 20
+	modules_enabled = {
+		"muc_mam";
+	}