I am not sure which notifications you talk about. If is an e-mail, then keep reading :)

I have in 'top' repository followin lines in .hg/hgrc file:
--------------------------------------------------
[extensions]
hgext.notify =

[hooks]
# Enable either changegroup or incoming.
# changegroup will send one email for each push,
# whereas incoming sends one email per changeset.
changegroup.notify = python:hgext.notify.hook

[email]
from = hg@xxxx.xx

[smtp]
host = smtp.xxxx.xx
baseurl = http://hg.xxxx.xx/project

[notify]
# multiple sources can be specified as a whitespace separated list
sources = serve push pull bundle

# set this to False when you are ready for mail to start sending
test = False
config = /store/etc/hg.users

strip = 4

# you can override the changeset template here, if you want.
# If it does not start with \n it may confuse the email parser.
# here is an example that makes the changeset template look more like hg log:
template = \nSubject: {webroot}: {desc|firstline|strip}\ndetails: {baseurl}{webr
oot}/rev/{node|short}\nchangeset: {rev}:{node|short}\nuser: {author}\ndate: {dat
e|date}\ndescription:\n{desc}\n

# max lines of diffs to include (0=none, -1=all)
maxdiff = 300

--------------------------------------------------

in addition to that there is a /store/etc/hg.users file with list of email adresses (we have a mailing list for developers team):
--------------------------------------------------
[reposubs]
* = team@xxxx.xx
--------------------------------------------------

Posted by Tigran Mkrtchyan on October 10, 2008 at 01:22 AM CDT #