Buffer metrics from failed writes in influxdb2 output if token is invalid (#5792)

(cherry picked from commit 3592433b06)

plugins/outputs/influxdb_v2/http.go

@@ -228,10 +228,11 @@ func (c *httpClient) writeBatch(ctx context.Context, bucket string, metrics []te
 	}
 
 	switch resp.StatusCode {
-	case http.StatusBadRequest, http.StatusUnauthorized,
-		http.StatusForbidden, http.StatusRequestEntityTooLarge:
+	case http.StatusBadRequest, http.StatusRequestEntityTooLarge:
 		log.Printf("E! [outputs.influxdb_v2] Failed to write metric: %s\n", desc)
 		return nil
+	case http.StatusUnauthorized, http.StatusForbidden:
+		return fmt.Errorf("failed to write metric: %s", desc)
 	case http.StatusTooManyRequests, http.StatusServiceUnavailable:
 		retryAfter := resp.Header.Get("Retry-After")
 		retry, err := strconv.Atoi(retryAfter)

plugins/outputs/influxdb_v2/influxdb.go

@@ -165,7 +165,7 @@ func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
 		log.Printf("E! [outputs.influxdb_v2] when writing to [%s]: %v", client.URL(), err)
 	}
 
-	return errors.New("could not write any address")
+	return err
 }
 
 func (i *InfluxDB) getHTTPClient(ctx context.Context, url *url.URL, proxy *url.URL) (Client, error) {