diff --git a/.ci/fvt_tests/relup.lux b/.ci/fvt_tests/relup.lux
index 2940f5ce0..9a6ba45e9 100644
--- a/.ci/fvt_tests/relup.lux
+++ b/.ci/fvt_tests/relup.lux
@@ -136,17 +136,20 @@
     !./bin/emqx_ctl broker metrics | grep "messages.publish"
     ???SH-PROMPT
 
+## We don't guarantee not to lose a single message!
+## So even if we received 290~300 messages, we consider it as success
 [shell bench]
     !curl --user admin:public --silent --show-error http://localhost:8081/api/v4/rules | jq -M --raw-output ".data[0].metrics[] | select(.node==\"emqx@127.0.0.1\").matched"
-    ?300
+    ?(29[0-9])|(300)
     ?SH-PROMPT
 
     !curl --user admin:public --silent --show-error http://localhost:8081/api/v4/rules | jq -M --raw-output ".data[0].actions[0].metrics[] | select(.node==\"emqx@127.0.0.1\").success"
-    ?300
+    ?(29[0-9])|(300)
     ?SH-PROMPT
 
+    ## The /counter API is provided by .ci/fvt_test/http_server
     !curl http://127.0.0.1:8080/counter
-    ???{"data":300,"code":0}
+    ?\{"data":(29[0-9])|(300),"code":0\}
     ?SH-PROMPT
 
 [shell emqx2]