fix: use retries in case app-detection-rule could not be deployed

Signed-off-by: Bernd Warmuth <[email protected]>

pkg/client/dtclient/config_client.go

@@ -322,6 +322,7 @@ func isApplicationNotReadyYet(resp rest.Response, theApi api.API) bool {
 	return isCalculatedMetricsError(resp, theApi) ||
 		isSyntheticMonitorServerError(resp, theApi) ||
 		isApplicationAPIError(resp, theApi) ||
+		isApplicationRule5xx(resp, theApi) ||
 		strings.Contains(string(resp.Body), "Unknown application(s)")
 }
 
@@ -341,6 +342,13 @@ func isApplicationAPIError(resp rest.Response, theApi api.API) bool {
 		(resp.Is5xxError() || resp.StatusCode == http.StatusConflict || resp.StatusCode == http.StatusNotFound)
 }
 
+// Special case (workaround):
+// Sometimes, the API returns 500 Internal Server Error e.g. when an application referenced by
+// an application detection rule is not fully "ready" yet.
+func isApplicationRule5xx(resp rest.Response, theApi api.API) bool {
+	return theApi.ID == "app-detection-rule" && resp.Is5xxError()
+}
+
 func isCredentialNotReadyYet(resp rest.Response) bool {
 	s := string(resp.Body)
 	return strings.Contains(s, "credential-vault") &&