Incorrect description for the pmm_mysql_too_many_connections Alerting Rule

The current description is:

This will yield an incorrect result for when the alert is triggered, because not only $value returned is always 1, but also because it is a much larger string including labels. For example:

The formula we use is:

So this will either be 0 when it’s false, or 1 when it’s true (and triggering). However, the actual value of threads_connected will be lost by the fact that this is a boolean comparison, so we should change the text, probably to something like: