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Copy file name to clipboardexpand all lines: docs/alerts/monitors/monitor-faq.md
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A common reason a metric monitor is disabled is the cardinality limit was exceeded. The default cardinality limits for metrics monitors are:
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* An aggregate metrics monitor can evaluate up to 15,000 time series.
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* A non-aggregate Metrics monitor can evaluate up to 3,000 time series.
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* For join queries, a cardinality limit of 3,000 rows is applied. These are query row output cardinality limit for join queries like (#A/#B) * 100 in #C row and similarly other queries.
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* For join queries, a cardinality limit of 3,000 rows is applied. These are query row output cardinality limit for join queries like `(#A/#B) * 100 in #C row` and similarly other queries.
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For example, if you use Kubernetes and have 20,000 pods in your deployment, a query that spans all pods, like the following, will result in the cardinality error.
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