Even then, in a commit message/PR description I (as a contributor) expect to read the origin/big picture of the bug, how it was discovered/narrowed down, refere

Even then, in a commit message/PR description I (as a contributor) expect to read the origin/big picture of the bug, how it was discovered/narrowed down, references to where it was introduced, what other solutions were tried — those kinds of things. Those aren't relevant to users though.