public ClientConnectionTimingsBuilder pendingAcquisitionEnd() {
        checkState(pendingAcquisitionStartTimeMicros > 0, "pendingAcquisitionStart() is not called yet.");
        pendingAcquisitionEndNanos = System.nanoTime();
        pendingAcquisitionEndSet = true;
        return this;
    }
Sets the time when the client ended to wait for an existing connection attempt in order to use
one connection for HTTP/2.

@throws IllegalStateException if {@link #pendingAcquisitionStart()} is not invoked before calling this.
core/src/main/java/com/linecorp/armeria/common/logging/ClientConnectionTimingsBuilder.java