0-21 - Too many instances built
Generally, it means that
org.apache.dubbo.common.timer.HashedWheelTimer creates too many instances.
Troubleshooting and resolution steps
It does not affect the construction of the instance, and there may be a risk of memory leaks.
Last modified January 3, 2023: Merge error code 3-3 to 3-8, 6-4 to 99-0. (#1796) (a687d30ae0)