You can inspect Announcer and then there's "Announcements" tab, however I don't think there's unified view.

On Mon, Aug 10, 2015 at 4:30 PM, Ben Coman <btc@openinworld.com> wrote:
How are Announcements currently debugged?�� I vaguely remember I was
once able to use AnnouncementSpy [1], but that seems not in Pharo5
anymore.�� Anyway, I'd rather avoid having to hunt within existing for
a particular announcer to observe. What I'd really like is something
like...

�� �� RubTextAcceptRequest spy

...to be able to observe anySuchAnnouncement in anyAnnouncer.

[1] http://pharo.gemtalksystems.com/book/LanguageAndLibraries/announcements/announcementspy/?_s=t9KcItW3v2fHASKr&_k=RRP9iYDxQLUO6DCy&_n&27

cheers -ben