Define a constant instead of duplicating this literal "total" 8 times.

Code Path:confignode/src/main/java/org/apache/iotdb/confignode/manager/load/LoadManagerMetrics.java

Duplicated string literals make the process of refactoring error-prone, since you must be sure to update all occurrences.
On the other hand, constants can be referenced from many places, but only need to be updated in a single place.

Open confignode/src/main/java/org/apache/iotdb/confignode/manager/load/LoadManagerMetrics.java and locate the eight duplicated "total" literals. Define one constant and use it for those references; done means the literal is no longer duplicated there and the existing behavior is unchanged.

Written by the indexing model from the issue text.