[ISC-Support #7237] additional BIND stats/counters - DLZ invocations

A customer has requested new stats/counters relating to DLZ, each of which would be per module: one to track the number of invocations and another to track the number of queries answered by the module.

https://support.isc.org/Ticket/Display.html?id=7237

Edited Nov 08, 2019 by Support RT

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