Masters have “header” sections, which are defined by html templates in the build repo. Milo needs a mechanism to display the equivalent information, but not necessarily with the same syntax.
Known use cases:
1. https://chromium-build.appspot.com/p/chromium/console
2 columns (1 text, 1 bubble)
2. https://build.chromium.org/p/client.v8/console
3 columns (2 text, 1 bubble). The 2 text columns are there to flow the header thinner
Comment 1 by efoo@chromium.org
, Oct 3 2017