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opreports_availability_strict (default: true)
- if missing or 1, then the normal behaviour for nodata-or-normal is used (ie. if reachability isn't present, it counts as nodata).
- If set to 0, then records with missing reachability but existing response time are fudged up so that the reachability = 100 (and loss = 0 if that's also missing) and therefore such a record does NOT count as nodata.
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