On the same page you can find the information about metrics available for Keyvault , as example: Overall Service Api Latency measure on MilliSeconds
It's possible to use on a dashboard and metric monitor on Key vault resources:
In the agregation you can use average, min, max and sum:
Whereas the dimensions you mentioned (ActivityType, ActivityName, StatusCode, StatusCodeClass, TransactionType) are related to Azure Activity Logs.
References:
- https://learn.microsoft.com/en-us/azure/azure-monitor/reference/supported-metrics/microsoft-keyvault-vaults-metrics
- https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/activity-log-insights
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Luis