feat(node): Cortex monitoring (#321)

Signed-off-by: Nicolas Lamirault <nicolas.lamirault@gmail.com>

diagrams/onprem/monitoring.py

@@ -8,6 +8,10 @@ class _Monitoring(_OnPrem):
     _icon_dir = "resources/onprem/monitoring"
 
 
+class Cortex(_Monitoring):
+    _icon = "cortex.png"
+
+
 class Datadog(_Monitoring):
     _icon = "datadog.png"
 

docs/nodes/onprem.md

@@ -142,6 +142,7 @@ Node classes list of onprem provider.
 
 ## onprem.monitoring
 
+- **diagrams.onprem.monitoring.Cortex**
 - **diagrams.onprem.monitoring.Datadog**
 - **diagrams.onprem.monitoring.Grafana**
 - **diagrams.onprem.monitoring.PrometheusOperator**