feat: fix get cluster_info error if there is no metric from start date

Signed-off-by: Youngjin Jo <youngjinjo@megazone.com>

src/plugin/connector/mimir_connector.py

@@ -100,6 +100,7 @@ def _get_unix_timestamp(start: str) -> (str, str):
     def get_kubecost_cluster_info(
         self,
         prometheus_query_endpoint: str,
+        start: str,
         service_account_id: str,
         secret_data: dict,
     ) -> dict:
@@ -118,7 +119,16 @@ def get_kubecost_cluster_info(
 
             response.raise_for_status()
 
-            result = response.json()
+            result = response.json().get("data", {}).get("result", [{}])
+
+            if result:
+                result = response.json()
+            else:
+                result = {}
+                _LOGGER.debug(
+                    f"[get_kubecost_cluster_info] Agent has no metric on your start date: {start}"
+                )
+
             return result
         except requests.HTTPError as http_err:
             _LOGGER.error(

src/plugin/manager/cost_manager.py

@@ -84,7 +84,7 @@ def get_data(
 
             prometheus_query_endpoint = f"{secret_data['mimir_endpoint']}/api/v1/query"
             cluster_info = self.mimir_connector.get_kubecost_cluster_info(
-                prometheus_query_endpoint, service_account_id, secret_data
+                prometheus_query_endpoint, start, service_account_id, secret_data
             )
 
             if promql_response:
@@ -153,7 +153,7 @@ def _make_cost_data(
         x_scope_orgid: str,
     ) -> dict:
         cluster_metric = (
-            cluster_info.get("data", {}).get("result", [])[0].get("metric", {})
+            cluster_info.get("data", {}).get("result", [{}])[0].get("metric", {})
         )
         costs_data = []
         for result in results: