All hosts from which I collect node_exporter metrics each have an
additional node_role metric (added via textfile collector) which identifies
all the Chef roles a given host has. As an example, say we have 3 hosts
with the following textfile collector metrics:
*server1:*
node_role{role="web_server_app1"}
*server2:*
node_role{role="redis_server"}
*server3:*
node_role{role="db_server"}
*server4:*
node_role{role="web_server_app2"}
I'm attempting to write a PromQL query which will return the current disk
usage % for hosts that do not have a specific role "web_server" assigned to
them. I've attempted the following PromQL query although it's invalid as
we end up with many results on the right hand side, which doesn't match the
many-to-one nature of the group left:
100 - (
(node_filesystem_free_bytes{mountpoint=“”/data} * on (hostname)
group_left(role) node_role{role!~“web_server.*”} )
/
(node_filesystem_size_bytes{mountpoint=“”/data} * on (hostname)
group_left(role) node_role{role!~“web_server”} )
*
100
)
How could I modify this query so that it correctly return the disk usage
percentage of server2 and server3?
I appreciate your help.
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