title: How to merge coverage from multiple .dat files in Bazel
body: <p>I am able to generate coverage.dat files with bazel command:</p>
  
  <pre><code>bazel coverage //tests/... --instrumented_filter=/src[/:]
  </code></pre>
  
  <p>This generates report for one of the classes, because coverage.dat files are generated separately for each instrumented file in different directories. How do I get a merged coverage.dat?</p>