create_revision is the creation revision of the given key

key is the subject key for the comparison operation.

lease is the lease id of the given key.

mod_revision is the last modified revision of the given key.

range_end compares the given target to all keys in the range [key, range_end). See RangeRequest for more details on key ranges.

result is logical comparison operation for this comparison.

target is the key-value field to inspect for the comparison.

value is the value of the given key, in bytes.

version is the version of the given key