Sometimes when i go to a question on SO it says "Locked by..." Another one is "closed as exact duplicate by" I was just curious as to how many different alerts like this a question can have on SO.
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The question statuses with messages are:
It is possible for a question to have at least 5 messages (migration from, mod notice, closed, locked, deleted) and perhaps 6 (above + protected), but a bounty cannot be active on a closed question.
As for what each of these states exactly are, there's an extensive faq here on Meta that you can browse.