Mechanism to communicate server timing data to the client (Server Timing)

server-timing.md Navigation and Resource Timing provides timing data for the fetch, but currently there is no interoperable way for the server to communicate own timing information to the client. For example: What steps were taken to generate the resource, and how long each took. Many sites already embed this type of information via HTML comments - e.g. wordpress emits <!--Page generated in X.X se

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Navigation Timingのサーバ版みたいな