As a GM, how can I tell what monsters will keep attacking unconscious PCs?
I am especially wondering what happens if a party all become unconscious during combat (that is, their HP all got reduced to zero and they are dying). They still have a chance to make death saving throws, I gather, and if one rolls a 20 they would gain a hit point, and become conscious, thus potentially rejoining the fight, or healing their companions.
Mainly, is there any rule for how monster(s) usually behave in this scenario (the whole party is unconscious)? If there is not, how can a DM adjudicate if they will finish the party off or not? Note: While I understand this depends on the specific opponents and the general scenario leading to the situation I am wondering what to do when the monster description or adventure don't dictate what happens?
I notice from Enemies knocking players unconscious instead of killing them for 4e that:
It is noted that most monsters will not attack characters who are dying. The DM is free to ignore that advice if desired.
Is this still true for D&D 5e or is there some other rule or general guidance for this eventuality?