There is currently a URL clash between the TaskManagersHandler and TaskManagerMetricsHandler, with both being routed to
As a result it is not possible to query the full set of metrics for a taskmanager, but only the hard-coded subset that is displayed on the metrics tab on the taskmanager page.
This is a side-effect of 6d53bbc4b92e651786ecc8c2c6dfeb8e450a16a3 making the URL's more consistent. The TaskManager page in the web-interface has 3 tabs: Metrics, Log and Stdout.
The URLs for these tabs are
which correspond to the REST URL's used. Previously, the metrics tab used
However, 70704de0c82cbb7b143dd696221e11999feb3600 then exposed the metrics gathered by the metrics system through the REST API. The assumption was that general information for the taskmanagers are retrieved via /taskmanager/<tmid>, similar to how the job-related URL's are structured, which sadly isn't the case.