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<p style="margin: 10px 0 0 0">Just some thoughts on exposing the metrics with JSON...</p>
<p style="margin: 10px 0 0 0">The way their JSON servlet example works is by optionally supplying a MetricFilter, which is just a simple Predicate clone that evals each metric and says yes/no, and then does a global dump to JSON using their Jackson serializer of any metric that passes the filter.</p>
<p style="margin: 10px 0 0 0">I think what we want to do if we can is support a REST style syntax where you can access a specific metric by name on the path, like /idp/profile/admin/metrics/net/shibboleth/idp/thing</p>
<p style="margin: 10px 0 0 0">My thought is that we could support metric groups the deployer creates themselves that would map to implementations of e.g. MetricFilter, AccessControl, etc. so you could on the fly create "resources" you could access that would correspond to arbitrary groupings of metrics you want to expose on a particular basis. e.g. /metrics/mygroup</p>
<p style="margin: 10px 0 0 0">If no mapping exists, the system could treat the path as implicitly a request for a specific named metric, and gin up a MetricFilter that only evals true for that specific metric name. Of course, /metrics could either fail, or be programmed to dump them all.</p>
<p style="margin: 10px 0 0 0">For authz, the resource fed into our API would be the metric group or name supplied in the pathinfo, so you could create policies specific to groups or individual metrics, and the operation would be "read".</p>
<p style="margin: 10px 0 0 0">Our flow could do a check for Accept-Encoding and either dump the metric raw, or to JSON using their Jackson code.</p>
<p style="margin: 10px 0 0 0">This would be pretty flexible and get us out of the middle of the whole process with one uber-flow that people could configure to expose any metric in the system together or separately and make it look like a big RESTy API, contingent on my PATH_INFO support actually working.</p>
<p style="margin: 10px 0 0 0">Probably could turn the seralization step into some kind of plugin if we wanted to, though that probably is overkill for right now, but needs further study.</p>
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