Service Account password Expiry

Where are your service accounts?  Are these in a cloud provider (e.g. Azure)?  Are they *nix service accounts, or are your service accounts across multiple types of "things" like some Linux servers connected to a central identity management, some are up in Azure, etc?

I don't see any OOTB modules in LM specific to this, but there are several modules that use this sort of monitoring pattern to collect data on "things that expire."  Depending on where these service accounts are you might need to write one or more custom Modules to collect a list of your service accounts and the # of days until the PW expires.

There are other modules that follow this pattern of collecting Days-until-data, and then alert Warning/Error/Critical based on the # of days left.  You could look at these, and then model anything custom on how these are setting up data points and alerting:

Microsoft_Azure_ActiveDirectoryApplicationSecrets
KempSSLExpirations