When I do “git push”, what do the statistics mean? (Total, delta, etc.)

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Short answer

This is merely the output of the git command git count-objects -v for the push (the same command is called for output when gc, pull and clone). More info in the man pages : git-count-objects(1).

$ git count-objects -v
...
size: 14 # The "Compressing objects: 100% (14/14)" part (the size in KiB)
in-pack: 22 # The "Counting objects: 22" part (the number of objects)
...

Long answer

Counting objects: 22, done.

This is git 22 internal objects being counted for that specific commit. Pretty much everything in git is an object, and are basically blobs saved in your .git/objects folder under their respective hash. More info in the man pages : 9.2 Git Internals – Git Objects.

Compressing objects: 100% (14/14), done.

This is git compressing the objects before send. The 14/14 is the progression in KiB of the compression (14 KiB to compress).

Writing objects: 100% (14/14), 1.89 KiB | 0 bytes/s, done.

This is git sending (if remote) and writing the objects. The 1.89 KiB | 0 bytes/s is the progression in KiB and the speed (0 bytes/s when finished).

Total 14 (delta 10), reused 0 (delta 0)

This is the output of the packfile algorithm in git (see 9.4 Git Internals – Packfiles) and is fairly obscure. It basically packs the unused objects, typically older history, in .git/objects/pack. After packing, git checks if it can reuse packs (hence the reused 0 part). The delta 0 part is the gain in KiB from the packing or from the reuse.

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