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Signed-off-by: Nic <qianyong@api7.ai>

Author: nic-6443

t/stream-plugin/prometheus.t

@@ -22,6 +22,7 @@ BEGIN {
         $ENV{TEST_NGINX_USE_HUP} = 1;
         undef $ENV{TEST_NGINX_USE_STAP};
     }
+    $ENV{TEST_NGINX_SLEEP} = 0.1;
 }
 
 use t::APISIX;