Ask HN: When you have production issues, what chat application do you use?

Two questions - 1.) When you have a production issue going on ( and if you ever do production support), what chat application do you use ?

2.) Do you wish there was a better application than the one you already use ?

3.) If you do, does it have capability to put attachments, etc. inside it and store the timeline for post mortem ?

<p>I've not found one, which is stable, can be used internally(security concerns) and has the above. I'll start building one if I don't find one. One last check before I dive in.