To ensure the Hotjar infrastructure can continually cope with the increasing levels of traffic, our engineering team periodically upgrades hardware and optimizes various parts of the system. While we are often able to do this with absolutely no downtime, we occasionally do need to run updates which require server restarts or re-configurations.
To ensure the minimal disruption for our customers, we have a dedicated weekly 15-minute maintenance window which engineers can use to perform infrastructural upgrades that may require downtime. The maintenance window is every Saturday between 22:00 UTC and 22:15 UTC, the time with the lowest traffic based on traffic logs.
If maintenance is being done, the app may be slow. In case of downtime, it will be completely unresponsive. To see Hotjar's current status you can visit this site: status.hotjar.com