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c880b07145
Adding updates to handle large zones (> 500,000). 1. `APIMetrics` allows configuration driven metrics collection. Metrics we need here are for large zones, so we have a flag to enable logging of memory usage. If `log-enabled=true` in the settings, start up a logging reporter that will memory usage to the log file every `log-seconds` seconds. 1. `CommandHandler` - increase the visibility timeout to 1 hour. In testing with a large zone of 600,000 records, the initial zone sync process took 36 minutes. Going to 1 hour should give us the ability to handle zones a little larger than 600,000 DNS records 1. `ZoneConnectionValidator` - increasing the timeout to 60 seconds from 6 seconds, as doing a zone transfer of large zones can take 10-20 seconds 1. `DNSZoneViewLoader` - adding logging around how many raw records are loaded so we can marry raw counts to memory usage 1. `core.Instrumented` - I put the `MemoryGaugeSet` into the `core` project as I thought it would be useful for the portal as well as the API.