The Connection Count panel in the Grafana dashboard is inaccurate.

[finalkira000]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

Accurately reflect the number of connections.

3. What did you see instead (Required)

bug

4. What is your TiDB version? (Required)

7.5.1，7.5.2

[djshow832]

#51889 is already fixed in v7.5.2. If it still happens, it may be another bug.
Can you provide more information to reproduce it?

[mayjiang0203]

One CT hit a similar issue at https://asktug.com/t/topic/1028444.

[dbakit]

• SQL 统计

• prometheus 数据

对比下来，感觉是 default 这个 RESOURCE_GROUP 的数据有异常，最明显的是245结尾那个 tidb-server 节点，default 的总连接数竟然是个负数

[YangKeao]

Oops, I may have found the issue: if the connection is closed before handshaking successfully, it will decrease the connection count. Because when the connection is closed, the connection count is always decreased (after the session has opened), but it'll increase only after successful handshake.

I'm not sure whether it's actually the issue you are facing now, but I'll try to fix it.