Add a way for knowing the springdoc-openapi made the request or not. Fixes #1163

Author: bnasslahsen

springdoc-openapi-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java

@@ -301,8 +301,10 @@ protected synchronized OpenAPI getOpenApi() {
 			LOGGER.info("Init duration for springdoc-openapi is: {} ms",
 					Duration.between(start, Instant.now()).toMillis());
 		}
-		else
+		else{
+			LOGGER.debug("Fetching openApi document from cache");
 			openApi = openAPIService.updateServers(openAPIService.getCachedOpenAPI());
+		}
 		return openApi;
 	}