the original node_exporter exposes a node_os_info metric with a set of
data about the system [1] which is then used by several dashboards.
openwrt.lua already exposes OS info, but using the node_openwrt_info
metric requires changes to existing dashboards, and would require more
complex lookups when there are non-OpenWrt hosts in the overview too.
as we've already called ubus and fetched the data, we can expose it in
two formats easily.
[1] https://github.com/prometheus/node_exporter/blob/d6d0e710bb7daf07a2743fde060f0d5f32c565f3/collector/os_release.go#L190-L192
Signed-off-by: Evgeni Golov <evgeni@golov.de>
Evgeni Golov
7d9cc2e95a