Network Security Perimeter log is called "Diagnostic Log."
But, "Diagnostic log" was merged into "resource log" in 2019, so NSP logs should also be referred to as "resource log".

Issue link:
https://learn.microsoft.com/en-us/azure/private-link/network-security-perimeter-diagnostic-logs

Reference:
https://learn.microsoft.com/en-us/azure/azure-monitor/reference/logs-index

Resource logs were previously known as diagnostic logs. The name was changed in October 2019 as the types of logs gathered by Azure Monitor shifted to include more than just the Azure resource.