interval doesn't seem to be respected for notifier

Hi,

For my notifier I set the interval to 2400, but I am receiving emails almost immediately after startup. How does this value work on startup?

```
class-name="email"
interval=2400
```

The lag is also 1 for this consumer group that I received an email from almost immediately. I have burrow in debug and can send other information if you'd like?

Regards,

Dennis O.

No file or test is named. Start by reproducing the email notifier with class-name="email", interval=2400, and the consumer group showing lag 1, then inspect the debug output around startup. Done means establishing whether the interval is honored on startup and documenting or correcting the observed behavior.

Written by the indexing model from the issue text.