mirror of https://github.com/tailscale/tailscale/
tsweb: add PrometheusVar, for vars that want to output varz themselves.
This enables the infrequent use of more complex Prometheus types, such as timeseries with high/irregular label cardinality, without needing to discover and implement generic abstracted type like LabelMap for each one. Signed-off-by: David Anderson <danderson@tailscale.com>pull/4235/head
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