Add metrics for scan_stats scanned and scan_stats issued#7

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RaptahJezus wants to merge 2 commits intorichardelling:masterfrom

RaptahJezus:master

Commits on Mar 29, 2020

Add metrics for stat scanned and stat issued
RaptahJezus
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Commits on Mar 30, 2020

Set scan and issue rate to 0 when no longer scanning
RaptahJezus
committed