For the past two to three weeks my workload has been such that my moderation duties had to be curtailed temporarily. As a courtesy I emailed email@example.com to let them know in advance that I wasn't going to be around much, but it's not so easy to let other mods know this as well.
One can either leave a message in Teachers Lounge chat spamming each of your fellow mods or I could email them all (equally spammy).
It'd be useful to have a field (in your profile?) so that you can explain in a few words why you've gone dark that would also appear in the Moderator Tools Admin summary page. Even if it's just a link or icon that pops up some text upon rollover or clicking.