There's a weekly online meeting for work that I record, and the first thing on every recording is me saying, "Right, so I've started recording." Probably overkill, but it takes almost no effort, and prevents just about any possible misunderstandings.
The only thing that's a bit of a pain is that the meeting app (understandably) doesn't reflect my own sound back to me; so I have to send the mic separately to OBS and to the meeting app, so that both the recording and the live meeting can hear my voice. That in turn means I have to mute in two places separately if I want neither one to (for instance) hear my crying toddler come into the room. That's not OBS's fault, and could probably be solved with yet another layer of software... but probably not worth it to me to set up at this point in time.