In certain queueing circumstances, a bi-level vacation policy according to which the server can switch over from the working vacation (WV) to the complete vacation (CV) has been noticed. In the WV (CV) mode, customers may exhibit reneging behavior due to the slow (absence of) service. This study examines the queueing metrics of a Markovian queueing system incorporating the concepts of the bi-level hybrid vacation strategy, state-dependent rates, discouraged customers, and waiting servers. The continued fraction, the probability generating function (PGF), and the confluent hypergeometric function are used to derive the transient queue size distributions. As a special case of the transient results, we derive the steady-state results. The analytical results for the average system size, variance, average reneging rate, system throughput, etc. are established. Furthermore, the cost function framed is optimized to provide the optimal decision parameters and respective minimum cost. Numerical simulation and parameter sensitivity have been performed by taking illustrations.
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