To change Mastodon's logging level, modify /opt/mastodon/live/.env.production with the one of the following
RAILS_LOG_LEVEL - Defaults to info, warn is recommended.
Use one of (debug, info, warn, error, fatal, unknown)
RAILS_LOG_LEVEL=warnLOG_LEVEL - Determines the amount of logs generated by Mastodon for the streaming processes. Defaults to info.
Use one of (silly, info)
LOG_LEVEL=info