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Adding metadata/labels to a route? #1647
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I've been wracking my brains for ways to wrap |
After some thought, I've come up with the following, which doesn't require any cowboy changes:
Add a middleware that goes in between
Getting |
One question that occasionally arises at work is "how do we attach telemetry labels to a cowboy route?". We'd like to be able to attach arbitrary metadata to a route, and have it available in the
cowboy_metrics_h
callback.Ideally, it would be an extra element in the route tuple, something like this:
...and would be picked up by the
cowboy_router
middleware and put in the env along withhandler
andhandler_opts
.(to avoid ambiguity, if you wanted this, you'd have to explicitly specify constraints, possibly empty -- or maybe
{Handler, Opts}
would need to be a tuple in this case).Does this seem like a good idea? Is there another way to do it right now?
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