In Junos is there any way I can monitor SSH or HTTPS login activity though logs? I would like to receive alerts if there are any changes made in the current config.
In Junos you can both of these requirements are captured in the default
messages log file.
show log messages
You can also create a dedicated log file for this if you want:
set system syslog file ACTIVITY auth any set system syslog file ACTIVITY change-log any