public static TooManyPendingAcquisitionsException get() {
        return Flags.verboseExceptionSampler().isSampled(TooManyPendingAcquisitionsException.class) ?
               new TooManyPendingAcquisitionsException() : INSTANCE;
    }
Returns a singleton {@link TooManyPendingAcquisitionsException} or newly-created exception
depending on the result of {@link Sampler#isSampled(Object)} of {@link Flags#verboseExceptionSampler()}.
core/src/main/java/com/linecorp/armeria/client/limit/TooManyPendingAcquisitionsException.java