What is this feature?
A follow-up for #101184, adds AlertRule.MissingSeriesEvalsToResolve to the APIs.
missing_series_evals_to_resolve must be specified too and it must be > 0.
POST /api/ruler/grafana/api/v1/rules/{folderUID} works in the following way:
If missing_series_evals_to_resolve is not sent or null, the rule keeps its existing value
If missing_series_evals_to_resolve > 0: updates to that value
If missing_series_evals_to_resolve = 0: resets to default (nil).
AlertRule.MissingSeriesEvalsToResolve can't be 0, so I used it to reset
In the Provisioning API, the value is just set if present and > 0. Otherwise it's reset:
PUT to /api/v1/provisioning/alert-rules/{UID}:
If missing_series_evals_to_resolve is nil, it's reset to the default value
If missing_series_evals_to_resolve > 0, it's updated
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