NullPointerException in NioOutboundPipeline.publishMetrics

[cnlzhang]

Hi there,
We have encountered an NullPointerException in NioOutboundPipeline.publishMetrics with 5.1.1 version as following logs:

2024-03-18 16:05:24,764 [ERROR] [hz.brave_knuth.IO.thread-out-1] [.h.i.s.t.TcpServerConnectionChannelErrorHandler]: [168.70.8.191]:5701 [business] [5.1.1] null
java.lang.NullPointerException: null
at com.hazelcast.internal.networking.nio.NioOutboundPipeline.publishMetrics(NioOutboundPipeline.java:462) ~[hazelcast-5.1.1.jar:5.1.1]
at com.hazelcast.internal.networking.nio.NioThread.processTaskQueue(NioThread.java:355) ~[hazelcast-5.1.1.jar:5.1.1]
at com.hazelcast.internal.networking.nio.NioThread.selectLoop(NioThread.java:290) ~[hazelcast-5.1.1.jar:5.1.1]
at com.hazelcast.internal.networking.nio.NioThread.executeRun(NioThread.java:249) [hazelcast-5.1.1.jar:5.1.1]

while the cpu and memory usage for hazelcast process increased rapidly, is there any bugs about this publishMetrics?

Thanks alot!!!