zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/DefaultClientChannelManager.java [352:357]:
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            Counter createNewConnCounter,
            Counter createConnSucceededCounter,
            Counter createConnFailedCounter,
            Counter requestConnCounter,
            Counter reuseConnCounter,
            Counter connTakenFromPoolIsNotOpen,
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zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/PerServerConnectionPool.java [90:95]:
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            Counter createNewConnCounter,
            Counter createConnSucceededCounter,
            Counter createConnFailedCounter,
            Counter requestConnCounter,
            Counter reuseConnCounter,
            Counter connTakenFromPoolIsNotOpen,
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