This software codebase began as a fork of prosody trunk (to be 0.9) merged with LW.Org's custom patches, initiating from August 7th 2012 (see first commit).

Being mainly based on Prosody a lot of Metronome's code is backport compatible, but as development progressed a good portion of it completely diverged from mainstream's to better suit LW.Org IM's needs.

Differences from Prosody are, but not limited to:

• The Pubsub API and wrapped modules, mod_pubsub and mod_pep
• The MUC API and wrapper plugins
• Pluggable MUC configuration
• Pluggable Routing API
• Core stack: Modulemanager, Usermanager, Hostmanager, Module API, etc...
• More aggressive memory usage optimisations
• Bidirectional S2S Streams
• Direct TLS S2S Streams and XEP-0368 resolution
• Dialback errors handling and "DB without DB" (XEP-344)
• The anonymous auth backend (mod_auth_anonymous & sasl.lua ineherent part)
• Included plugins, utils
• SPIM prevention system
• Hits/blacklist/whitelist based host filtering (mod_gate_guard)
• In-Band Registration verification and account locking mechanism
• The HTTP API
• XEP-0252 support for BOSH's JSON Padding
• Extensive Microblogging over XMPP support
• Daemon Control Utility
• It does have only one server backend being libevent and has a hard dep. on lua-event