The timestamp of the will message is wrong

[lafirest]

What happened?

The timestamp of the will message is assigned at the session creation time, this is not correct and makes all the will messages counted by the slow subscriptions feature.

Reported by: https://askemq.com/t/topic/4792/3

What did you expect to happen?

The timestamp for the will message should be the disconnected time of the session.

How can we reproduce it (as minimally and precisely as possible)?

No response

Anything else we need to know?

No response

EMQX version

$ ./bin/emqx_ctl broker
# paste output here

OS version

# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here

Log files