Alert on any items in a Group not being updated e.g. within last 24hrs

Setup, Configuration and Use Scripts & Rules
6

I’m not sure I’d be worried about 50 expires (timers) but I understand your concern.

To do it using a rule, assuming you have them in a group and set up persistence

Using JRuby rule file:

every :minute do
  FreshnessCheckGroup.members.select { |sensor| sensor.state? && sensor.last_update < 24.hours.ago }.update(NULL)
end

You can also send yourself an email, or sound an alert through a speaker using TTS listing the names of all the stale items etc if you prefer.