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This variable will report the maximum number of simultaneous tcp clients that BIND has served while running. It can be verified by running rndc status, then inspect "tcp high-water: count", or by generating statistics file, rndc stats, then inspect the line with "TCP connection high-water" text. The tcp-highwater variable is atomically updated based on an existing tcp-quota system handled in ns/client.c. (cherry picked from commit 66fe8627)
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