properly link api diagnostic to newly created logger

Author: lucashuet93

src/APIM_ARMTemplate/apimtemplate/Creator/TemplateCreators/DiagnosticTemplateCreator.cs

@@ -15,14 +15,18 @@ public DiagnosticTemplateResource CreateAPIDiagnosticTemplateResource(APIConfig
                 properties = new DiagnosticTemplateProperties()
                 {
                     alwaysLog = api.diagnostic.alwaysLog,
-                    loggerId = api.diagnostic.loggerId,
                     sampling = api.diagnostic.sampling,
                     frontend = api.diagnostic.frontend,
                     backend = api.diagnostic.backend,
                     enableHttpCorrelationHeaders = api.diagnostic.enableHttpCorrelationHeaders
                 },
                 dependsOn = dependsOn
             };
+            // set the version set id
+            if (api.diagnostic.loggerId != null)
+            {
+                diagnosticTemplateResource.properties.loggerId = $"[resourceId('Microsoft.ApiManagement/service/loggers', parameters('ApimServiceName'), '{api.diagnostic.loggerId}')]";
+            }
             return diagnosticTemplateResource;
         }
     }