# Troubleshooting for CloudWatch Database Insights
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Use the following information to troubleshoot issues for CloudWatch Database Insights.

## Applying tags to Amazon RDS resources
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To apply tags to your databases, use the Amazon RDS API, AWS CLI, or Amazon RDS console. For more information, see the following topics.
+ [AddTagsToResource](https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_AddTagsToResource.html) in the *Amazon RDS API Reference*
+ [add-tags-to-resource](https://docs.aws.amazon.com/cli/latest/reference/rds/add-tags-to-resource.html) in the *Amazon RDS Command Line Reference*
+ [Tagging Amazon Aurora and Amazon RDS resources](https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_Tagging.html) in the *Amazon Aurora User Guide*

## Maximum DB instances for fleets
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You can't monitor more than 500 DB instances in a database fleet. You can use filters to create a fleet health view with less than 500 DB instances.