MongoPoolAutoConfiguration
@ConditionalOnClass(name = ["me.ahoo.wow.mongo.MongoStoreProvider"] )
The pool gauge of the MongoDB stores (MongoPoolGauge), when the application has wow-mongo: added to the MongoClient the host makes (MongoClientAutoConfiguration) or Spring Boot makes (through its settings customizer), so the stores bound their queries by the client's pool and read their write pressure from it. An application that builds its own client adds the gauge itself (MongoPoolGauge.applyTo).