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I am adding a meter binder for R2DBC pool metrics. Metrics are extracted from class reactor.pool.Pool.PoolMetrics.
I could only bind metrics from class org.reactivestreams.Publisher.ConnectionFactory and casting to io.r2dbc.pool.ConnectionPool when possible, because the way Micrometer register the ConnectionPool.
It is my first time contributing so I did not know how to document the version in JavaDocs. I used the next version 4.2.1.