[7.10] docs: Transaction metrics reference (#4345)

[bmorelli25]

Backports the following commits to 7.10:

• docs: Transaction metrics reference (docs: Transaction metrics reference #4345)

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• Build Cause: [Pull request #4374 opened]

• Start Time: 2020-11-02T22:10:59.995+0000

• Duration: 10 min 59 sec