linux$ git log | sed -nE 's/^ *([^ ]+-by:).*$/\1/p' | tr '[:upper:]' '[:lower:]' | sort | uniq -c | egrep -v ' [0-9] '
         20 ack-by:
         74 acked-and-tested-by:
     195801 acked-by:
         24 acked-for-backlight-by:
         49 acked-for-mfd-by:
         19 acked-in-principle-or-something-like-that-by:
         21 acked-off-by:
         10 analysed-by:
         47 analyzed-by:
         26 based-on-a-patch-by:
         97 based-on-patch-by:
         15 based-on-work-by:
        128 bisected-by:
         18 boot-tested-by:
         37 build-tested-by:
        147 co-authored-by:
       4779 co-developed-by:
        175 debugged-by:
         60 diagnosed-by:
         11 disliked-by:
         11 eviewed-by:
         51 fixed-by:
         18 fix-suggested-by:
         32 found-by:
         48 generated-by:
         19 improvements-by:
         79 inspired-by:
         18 located-by:
         10 not-acked-by:
         86 noticed-by:
         30 original-by:
        140 originally-by:
         95 original-patch-by:
         44 pointed-out-by:
         14 proposed-by:
         10 reivewed-by:
         22 reported-and-acked-by:
         12 reported-and-analyzed-by:
         77 reported-and-bisected-by:
         12 reported-and-debugged-by:
         23 reported-and-suggested-by:
       3017 reported-and-tested-by:
         21 reported-bisected-and-tested-by:
      58990 reported-by:
         11 requested-and-tested-by:
        363 requested-by:
         10 review-by:
         55 reviewd-by:
        513 reviewed-and-tested-by:
     304543 reviewed-by:
         16 reviewed-off-by:
         67 reviwed-by:
         11 root-caused-by:
         29 sigend-off-by:
         10 signed-by:
        157 signed-of-by:
    2253448 signed-off-by:
         59 singed-off-by:
         54 spotted-by:
         32 suggested-and-acked-by:
         12 suggested-and-reviewed-by:
         17 suggested-and-tested-by:
      15568 suggested-by:
         48 tested-and-acked-by:
         22 tested-and-reported-by:
         35 tested-and-reviewed-by:
      62630 tested-by:
         12 verified-by:

If you don't filter out the tags with less than 10 uses, there are some fun ones. For example, "You're-my-ding-a-ling-by:" should be used more often. :)

Well, if it was, the maintainer didn't communicate that well/at all:

"I prefer my version".

Now to look at this patch it looks Michael took the report, debugged, tested, and resolved the issue, when all he actually did is move a single line to outside of a conditional.

> and required work shows a different set of expectations

You're really stretching here, the only "required work" missing was a sign off, which Michael could have given.

In any other environment, this would be plagiarism. And it looks morally poor.

https://news.ycombinator.com/item?id=37675544

But it ain't much of a sticking point. Most of the time it is just an oversight that can be pointed out and corrected. All it takes is for the maintainer to point it out and ask for it and then then the author to do it. (The patch author themselves need to do it or else there wouldn't be a point to the sign-off; forging a sign-off would defeat the purpose.)