public final int getNumber() {
            if (this == UNRECOGNIZED) {
              throw new java.lang.IllegalArgumentException(
                  "Can't get the number of an unknown enum value.");
            }
            return value;
          }
<pre>
Most of the nodes are available all of the time.
Recommended for serving workloads.
</pre>

<code>AVAILABILITY_OPTIMIZED = 2;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java