# Gateway details - Overview The **Overview** tab provides insights derived from sampled spans after transaction search is enabled. The **Gateway metrics** section lists all of the agents associated with the selected gateway, and it provides information about the number of sessions, traces and errors for each associated agent. ![Gateway metrics](http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/images/overview_metrics.png) Additionally, the **Overview** tab includes the following interactive charts. ------ #### [ Invocations ] The **Invocations** chart shows the total number of API requests made. Each API call counts as one invocation, regardless of the response status. ------ #### [ System and client errors ] The **System and client errors** chart provides information about the number of API requests that failed with system erros (`5xx` error codes) and user errors (`4xx` status codes, excluding `429`), and the overall error rate as a percentage. ------ #### [ Throttles ] The **Throttles** chart provides information about the number API requests that were throttled (`429` status code) by the service, and the overall throttle rate as a percentage. ------ #### [ Invocation latency ] The **Invocation and latency** chart provides information about the average latency for list and call tools. It also provides information about average latency between when the service received the request and when it begins sending the first response token. ------ #### [ Policy decisions over time ] The **Policy decisions over time** chart provides information about the number of decisions that resulted in `allow` and `deny` authorization actions. To view decisions for a specific policy, select the policy in the drop-down. ![Policy decisions over time chart](http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/images/05_policydecisions.png) ------ #### [ Policy decisions: Per policy distribution ] The **Policy decisions: Per policy distribution** chart lists all of the policy engines associated with the selected gateway, and shows the policy, number of allows and denies, and enforcement mode for each policy engine. You can choose a policy engine or policy in the list to view more details about it in the Amazon Bedrock AgentCore console. ![Policy decisions: Per policy distribution](http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/images/06_policydistribution.png) ------