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 29 September 2021. It is expected to take around 20 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.