Alert when item in a group has not been updated for x hours?

[rlkoshak (Rich Koshak)]

In addition to @pahansen’s links, I’ll include:

Design Patterns: Generic Is Alive

Edit: Rewritten for OH 4. Please see https://community.openhab.org/t/design-pattern-what-is-a-design-pattern-and-how-do-i-use-them/40319 for a description of what Design Patterns are and how to use them. Problem Statement Many sensors report status to openHAB periodically (e.g. temperature sensor) or unpredictably (e.g. motion sensors) and a subset of these sensors do not have a built in way for openHAB to query whether or not they are alive. The only way for openHAB to detect that these devic…

Pay particular attention to the Expire Binding version near the bottom of the first post.