[MM-61768] Fix #29337 Errcheck in channels/app/platform/metrics.go (#29347)

server/.golangci.yml

@@ -101,7 +101,6 @@ issues:
         channels/app/platform/helper_test.go|\
         channels/app/platform/license.go|\
         channels/app/platform/log.go|\
-        channels/app/platform/metrics.go|\
         channels/app/platform/searchengine.go|\
         channels/app/platform/service.go|\
         channels/app/platform/service_test.go|\

server/channels/app/platform/metrics.go

@@ -165,7 +165,9 @@ func (pm *platformMetrics) initMetricsRouter() error {
 	}
 
 	rootHandler := func(w http.ResponseWriter, r *http.Request) {
-		metricsPageTmpl.Execute(w, pm.metricsImpl != nil)
+		if err := metricsPageTmpl.Execute(w, pm.metricsImpl != nil); err != nil {
+			pm.logger.Error("Failed to execute template", mlog.Err(err))
+		}
 	}
 
 	pm.router.HandleFunc("/", rootHandler)
@@ -204,7 +206,9 @@ func (pm *platformMetrics) servePluginMetricsRequest(w http.ResponseWriter, r *h
 		mlog.Error(appErr.Error())
 		w.WriteHeader(appErr.StatusCode)
 		w.Header().Set("Content-Type", "application/json")
-		w.Write([]byte(appErr.ToJSON()))
+		if _, writeErr := w.Write([]byte(appErr.ToJSON())); writeErr != nil {
+			mlog.Error("Failed to write error response", mlog.Err(writeErr))
+		}
 		return
 	}
 
@@ -225,7 +229,9 @@ func (pm *platformMetrics) servePluginMetricsRequest(w http.ResponseWriter, r *h
 		mlog.Error(appErr.Error())
 		w.WriteHeader(appErr.StatusCode)
 		w.Header().Set("Content-Type", "application/json")
-		w.Write([]byte(appErr.ToJSON()))
+		if _, writeErr := w.Write([]byte(appErr.ToJSON())); writeErr != nil {
+			mlog.Error("Failed to write error response", mlog.Err(writeErr))
+		}
 		return
 	}