docs: improve wait_for_index metrics description #10717
Merged
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Old description of
{plan,worker}.wait_for_index
described the metricin terms of waiting for a snapshot which has two problems:
expected to know which use we're referring to here.
before taking a snapshot: the raft index of the object to be
processed (plan or eval).
The new description tries to cram all of that context into the tiny
space provided.
See #5791 for details about the
wait_for_index
mechanism in general.