Standardize active connection graphs on data plane dashboards

[jaellio]

Description:

The number of active connections to envoy clusters is displayed differently in each data plane dashboard.

OSM Pod to Service Metrics irate(envoy_cluster_upstream_cx_active{source_pod_name="$source_pod",source_namespace="$source_namespace",envoy_cluster_name!~"osm-controller|envoy-metrics-cluster|envoy-tracing-cluster|passthrough-outbound"}[1m])

OSM Service to Service Metrics sum(envoy_cluster_upstream_cx_active{source_service="$source_service",source_namespace="$source_namespace",envoy_cluster_name="$destination_service"})

OSM Workload to Service Metrics envoy_cluster_upstream_cx_active{source_namespace="$source_namespace",source_workload_kind="$source_workload_kind",source_workload_name="$source_workload_name",envoy_cluster_name!~"osm-controller|envoy-metrics-cluster|envoy-tracing-cluster|passthrough-outbound"}"

Affected area (please mark with X where applicable):

• Install [ ]
• SMI Traffic Access Policy [ ]
• SMI Traffic Specs Policy [ ]
• SMI Traffic Split Policy [ ]
• Permissive Traffic Policy [ ]
• Ingress [ ]
• Egress [ ]
• Envoy Control Plane [ ]
• CLI Tool [ ]
• Metrics [ x ]
• Certificate Management [ ]
• Sidecar Injection [ ]
• Logging [ ]
• Debugging [ ]
• Tests [ ]
• Demo [ ]
• CI System [ ]

Expected behavior:

The active connection graphs should display the current number of active connections from the source to any specified destination.