Azure Event Hub message retention doesn't seem to work

Question

We include dates in the events sent to our hub. Whenever I connect a new Azure Function to our Event Hub with a new consumer group, it seems to receive all events ever sent to t

Answer 1

Retention time is the minimum guaranteed period, not the maximum or exact. 1 day retention means you will have all the messages from last day, but maybe some more messages too.

So you can rely on 1 day of retention, but be prepared to see older messages too.