NewProber creates a Prober from Opts.

ProbeKeyForRange return the key to probe for a given range.

Metrics groups together the metrics that kvprober exports.

Opts provides knobs to control kvprober.Prober.

Prober sends queries to KV in a loop.

ProberOps collects the methods used to probe the KV layer.

Step is a decision on what range to probe next, including info needed by kvprober to execute on the plan, such as the key to probe.