This problem may happen when your dashboard was created with a metric
that was later deprecated and removed from Azure. To verify that it is
the case, open the Metrics tab of your resource, and check the
available metrics in the metric picker. If the metric is not shown,
the metric has been removed from Azure. Usually, when a metric is
deprecated, there is a better new metric that provides with a similar
perspective on the resource health.
Solution: Update the failing tile by picking an alternative metric for your chart on dashboard
According to
docs
,Solution: Update the failing tile by picking an alternative metric for your chart on dashboard