This adds constructor'esque configuration options for prometheus assets.
They still reference global _config default values for backwards compatibility
but allow overriding values for new instances of prometheus assets.
Currently, we use the node:node_memory_bytes_total:sum and node:node_memory_bytes_available:sum
recording rules for the memory node query.
These recording rules have been removed in https://github.com/coreos/kube-prometheus/pull/191.
This fixes it by using raw queries.
Currently, only cluster wide admins have the permissions to view
metrics resources. This fixes it by adding a read-only cluster role
which includes aggregation labels to synthesize permission rules for
standard user-facing roles according to [1].
Note that only the "pods" resource is granted as reading "nodes"
metrics requires a cluster wide permission.
[1] https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles
Currently, we are mounting `/root` from the host as `/host/root`.
Instead simply `/` from the host should be mounted.
This fixes it
Signed-off-by: Sergiusz Urbaniak <sergiusz.urbaniak@gmail.com>
Sergiusz Urbaniak
