Persistent connection model is not allowed on labsdb hosts for the reasons expressed on the Connection handling policy.

Your connections are currently taking half of the used connections, impacting other users:

root@labsdb1005[(none)]> pager grep -c s52584
PAGER set to 'grep -c s52584'
root@labsdb1005[(none)]> SHOW PROCESSLIST;
80
164 rows in set (0.00 sec)

Please disable connection pooling on your tools, or request a dedicated mysql instance to use in any way you like (toolsdb is a *highly* shared resource, so limits have to be enforced). Enforcing it myself (for example, limiting your max connections to a handful of them) may cause you an outage, so I would prefer if it was you that solved this issue yourself. Thank you for your understanding.