Repeated alerter notifications when using times_type / time_lower / time_upper / delay=True

[cpina]

Situation: I have three monitors that fail.
I used to have (simplified):

[monitor]
interval=5

[reporting]
loggers=logfile,html
alerters=email

[email]
type=email
tz=Europe/Madrid
host=mail.example.org
from=User <[email protected]>
[email protected]
username=user01
password=the_password
ssl=starttls

Now I've added to this alerter:

times_type=not
time_lower=04:00
time_upper=05:00
delay=true

(side note: ideally I would add this to a monitor (in this case, think of a loadavg that spikes at night due to some night jobs... but here I am setting it up for everything from 4am to 5am).

As soon as I add the times_type / timer_lower / time_upper / delay: simplemonitor sends to the email that the three failing monitors are failing on each check (after the tolerance period).

If I remove the "delay=true": it does not send repeatedly, only once on simplemonitor start (after the tolerance...).