We’ve a situation where munin monitoring is showing that the maximum used connections grows (by periodic jumps) but never falls. It continues to do this until the mysql server is rebooted, when it goes back to the starting level and the process starts all over again.
It is puzzling why the number of connections is growing - numbers of threads connected or new connections are pretty steady. And running “show processlist” frequently shows only a handful of active processes.
What could be causing the apparently never ending growth in maximum used connections?