posible hyper task leak on console_subscriber server

[pymongo]

Bug Report

when my server start, only 20 tasks and 0 CPU usage, but two hour pass the tasks group to 3000+ and CPU usage 16%
only one tokio/console client request to my server, no any other request

compare to the same server/app which I turn off console_subscriber server running more than two hour, the CPU usage still 0.6%

I think turn on console subscriber server and use one client to connect cause these bug

Version

console commit ef4150725476942784f1ad4cacfb21c3bed17c54
tracing v0.1.29

Platform

inux ww 5.10.84-1-MANJARO #1 SMP PREEMPT Wed Dec 8 09:50:30 UTC 2021 x86_64 GNU/Linux

Description

the console subscriber server's hyper task count keep increasing

[pymongo]

Extra infromation

thread 'console_subscriber' panicked at 'attempt to subtract with overflow', /home/w/repos/clone_repos/console/console-subscriber/src/aggregator/mod.rs:1079:45
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

the console_subscriber has a panic

[pymongo]

sorry my mistake, I should report to tokio/console