Currently, the consul_exporter exposes 4 series per health_node and
health_service status check. Each with a label indicating the status
(maintenance, warning, critical, or passing). In larger environments, this
creates quite a few extra series.
As somewhat of a precedent, the status is already being mapped to a value
for the consul_serf_lan_member_status metric (as Consul's API provides this
mapping).
# HELP consul_serf_lan_member_status Status of member in the cluster.
1=Alive, 2=Leaving, 3=Left, 4=Failed.
I wanted to get some thoughts around this before pursuing a PR.
In my example, I used -2=maintenance, -1=warning, 0=critical, and 1=passing
to fall in line with the Prometheus paradigm of up=0 (down) and up=1 (up).
Since we have two additional values, the negative numbers play more nicely
when trying to do a value mapping in Grafana. Not married to the values
themselves though. :)
Present Example:
consul_health_node_status{check="serfHealth",node="example_node",status="critical"}
0
consul_health_node_status{check="serfHealth",node="example_node",status="maintenance"}
0
consul_health_node_status{check="serfHealth",node="example_node",status="passing"}
1
consul_health_node_status{check="serfHealth",node="example_node",status="warning"}
0
consul_health_service_status{check="service:10.0.0.1_443",node="example_node",service_id="10.0.0.1_443",service_name="auth_service",status="critical"}
0
consul_health_service_status{check="service:10.0.0.1_443",node="example_node",service_id="10.0.0.1_443",service_name="auth_service",status="maintenance"}
0
consul_health_service_status{check="service:10.0.0.1_443",node="example_node",service_id="10.0.0.1_443",service_name="auth_service",status="passing"}
1
consul_health_service_status{check="service:10.0.0.1_443",node="example_node",service_id="10.0.0.1_443",service_name="auth_service",status="warning"}
0
Proposed Example:
# HELP consul_health_node_status Status of health checks associated with a
node. -2=maintenance, -1=warning, 0=critical, 1=passing
consul_health_node_status{check="serfHealth",node="example_node"} 1
# HELP consul_health_service_status Status of health checks associated with
a service. -2=maintenance, -1=warning, 0=critical, 1=passing
consul_health_service_status{check="service:10.0.0.1_443",node="example_node",service_id="10.0.0.1_443",service_name="auth_service"}
1
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