Maintenance will be performed on git.ligo.org, chat.ligo.org, containers.ligo.org, and docs.ligo.org, starting at approximately 9am MST on Tuesday 7th December 2021. It is expected to take around 15 minutes and there will be a short period of downtime towards the end of the maintenance window. Please address any comments, concerns, or questions to computing-help@igwn.org.