The official channels for announcements are these:
nadeko.net Status Page: To
report the status of the services in case something goes wrong, or
if somethings needs maintenance. Those kind of things will be
reported there.
nadeko.net Matrix Space: Same as above, to announce new services or changes to the
services.
Make sure to join the announcements room of course (˶ˆᗜˆ˵).
That's it, I will also add the announcements here, in this webpage, but
that will be done later.
