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905190ac06
Add a support for defining a probability (a value in a [0,1] range) for tracing the next CQL request. Traces for requests that are chosen to be traced due to this feature are not going to flushed immediately. Use std::subtract_with_carry_engine (implements the "lagged Fibonacci" algorithm) random number engine for fastest generation of random integer values. Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>