Wikipedia:Toolserver/status
This box shows the status of the Toolserver. This is a server from Wikimedia Deutschland that provides users a place to host their tools, such as web services and bots.
The information is updated hourly by BryanBot. If there is no update after an hour, it is likely that the entire Toolserver is down. It is possible that while the user bot (BryanBot) is up, the database (MySQL) is down. When MySQL is down, bots and web services that require MySQL will not function.
The Toolserver database contains a replica of all Wikimedia wiki databases. Replication lag indicates how far the replication is behind real time. Services that read information from those databases will not return actual values, but values as they were at a time interval equal to the lag earlier. Replication lag particularly concerns Duesentrieb's check usage, which will return out-dated information if replication lag is too high.
Different wikis are on different database clusters (s1, s2 and s3) and can thus have a different replication lag. See this post for information on s1, s2 and s3. The English Wikipedia is on s1.