title: what dose k8 mean in bazel info local_cpu_resources' output
body: <p>When I run <code>bazel info --local_cpu_resources HOST_CPUS</code> on <code>macos</code> and <code>ubuntu</code></p>
  <h3>In Macos</h3>
  <pre><code>`bazel-bin: .../9dcdc19e81f948a3daf2cc314e0d4bf1/execroot/demo/bazel-out/darwin-fastbuild/bin`
  
  `bazel-genfiles: .../9dcdc19e81f948a3daf2cc314e0d4bf1/execroot/demo/bazel-out/darwin-fastbuild/bin`
  
  `bazel-testlogs: .../9dcdc19e81f948a3daf2cc314e0d4bf1/execroot/demo/bazel-out/darwin-fastbuild/testlogs`
  </code></pre>
  <h3>In Ubuntu</h3>
  <pre><code>`bazel-bin: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/bin`
  
  `bazel-genfiles: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/bin`
  
  `bazel-testlogs: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/testlogs`
  </code></pre>
  <h3>Question</h3>
  <ul>
  <li><a href="https://en.wikipedia.org/wiki/Darwin_(operating_system)" rel="noreferrer"><code>Darwin</code></a> may mean <code>OS</code> in <code>macos</code>.</li>
  <li>What does <code>k8</code> mean in <code>ubuntu</code>?</li>
  <li>On other platforms, like <code>windows</code>, what will be output? why?</li>
  </ul>
  <h3>Reference information</h3>
  <blockquote>
  <p><a href="https://docs.bazel.build/versions/master/be/make-variables.html#predefined_variables" rel="noreferrer">https://docs.bazel.build/versions/master/be/make-variables.html#predefined_variables</a></p>
  <p><a href="https://docs.bazel.build/versions/master/guide.html#distinct_host_configuration-true-default" rel="noreferrer">https://docs.bazel.build/versions/master/guide.html#distinct_host_configuration-true-default</a></p>
  </blockquote>
  <h3>Full output on Ubuntu</h3>
  <pre><code>root@608a654a26de:/home/servlet/demo# bazel info --local_cpu_resources HOST_CPUS
  Extracting Bazel installation...
  Starting local Bazel server and connecting to it...
  bazel-bin: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/bin
  bazel-genfiles: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/bin
  bazel-testlogs: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out/k8-fastbuild/testlogs
  character-encoding: file.encoding = ISO-8859-1, defaultCharset = ISO-8859-1
  command_log: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/command.log
  committed-heap-size: 40MB
  execution_root: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo
  gc-count: 8
  gc-time: 55ms
  install_base: /root/.cache/bazel/_bazel_root/install/8eab0b6f2b5ac882f3a1a7c2494aade6
  java-home: /root/.cache/bazel/_bazel_root/install/8eab0b6f2b5ac882f3a1a7c2494aade6/embedded_tools/jdk
  java-runtime: OpenJDK Runtime Environment (build 11.0.2+7-LTS) by Azul Systems, Inc.
  java-vm: OpenJDK 64-Bit Server VM (build 11.0.2+7-LTS, mixed mode) by Azul Systems, Inc.
  max-heap-size: 524MB
  output_base: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4
  output_path: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/execroot/demo/bazel-out
  package_path: %workspace%
  release: release 1.2.0
  repository_cache: /root/.cache/bazel/_bazel_root/cache/repos/v1
  server_log: /root/.cache/bazel/_bazel_root/d89113122c03ccb06b1d63e7c96f20e4/java.log.608a654a26de.root.log.java.20191128-034422.19
  server_pid: 19
  used-heap-size: 22MB
  workspace: /home/servlet/demo
  </code></pre>