hisCollectCov

Enables COV history collection of the curVal. The tag value must be Marker to collect on any change. Or if the point is Numeric, then the value may be a Number which indicates the tolerance a point must change before logged.

COV collection is rate throttled using a limit determined as follows:

• use hisCollectCovRateLimit if configured
• if a numeric with hisCollectInterval, then never collect faster than 1/10 of the interval or 1min (whichever is lower)
• if a numeric without hisCollectInterval then use 1min as rate limit
• fallback to 1sec rate limit for non-numerics

Also see point.