I think it should be a good advertisement for the question: attractive (e.g. interesting), and accurate (not like click-bait).
Its length and formatting should be similar to the titles of other questions.
It has three purposes:
- To attract (or inform) readers who are browsing a list of question titles: "This topic looks interesting to me!"
- To summarise the question for people who are reading the topic. The text (paragraphs) of the question may be long, describing the problem and the scenario and the actors. If a reader asks, "Yes but what's the question in all this", they should see that summarised in the title.
- To help the topic be found via a search engine (such as Google) -- a search engine probably puts more weight on text in a heading than on text inside a paragraph, so you might want the title to contain relevant key words which identify or help to classify the topic.
All the titles you gave as examples see to me adequate (though I haven't checked to see how closely they match their topic and whether they can be improved).
Conversely I think a title like, "What can I say in this situation?" isn't informative (says nothing about the situation in question).