public Builder mergeInterval(com.google.type.Interval value) {
        if (intervalBuilder_ == null) {
          if (((bitField0_ & 0x00000008) != 0)
              && interval_ != null
              && interval_ != com.google.type.Interval.getDefaultInstance()) {
            getIntervalBuilder().mergeFrom(value);
          } else {
            interval_ = value;
          }
        } else {
          intervalBuilder_.mergeFrom(value);
        }
        if (interval_ != null) {
          bitField0_ |= 0x00000008;
          onChanged();
        }
        return this;
      }
<pre>
The start and end time of the reservation.
</pre>

<code>.google.type.Interval interval = 4;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Reservation.java