This is a very minor issue but odd so I figured I’d ask to see if I’m missing something.
I’m using Z2M, Mosquitto (external to HA, configured to be persisting). When I do HA OS updates, release updates/etc all of my graphs end up with a gap because HA was down. Now the broker is still up and running shouldn’t it be persisting and collecting this information and replay it back when HA comes back up and starts to monitor again?
No. MQTT works in real time. It only forwards the latest state (or stored latest state if the retained flag is set) not multiple past states for each topic.