feat: Add namespace field for pipeline, isb, monovertex and numaflow controller metrics

[chandankumar4]

Fixes #226

Modifications

• Added metrics with namespace

# HELP numaflow_pipelines_running Number of Numaflow pipelines running
# TYPE numaflow_pipelines_running gauge
numaflow_pipelines_running{intuit_alert="true",namespace="example-namespace"} 1
# HELP numaflow_isb_services_running Number of Numaflow ISB Service running
# TYPE numaflow_isb_services_running gauge
numaflow_isb_services_running{intuit_alert="true",namespace="example-namespace"} 1
# HELP numaflow_monovertices_running Number of Numaflow monovertices running
# TYPE numaflow_monovertices_running gauge
numaflow_monovertices_running{intuit_alert="true",namespace="example-namespace"} 1
# HELP numaflow_controller_running Number of Numaflow controller running
# TYPE numaflow_controller_running gauge
numaflow_controller_running{intuit_alert="true",name="numaflow-controller",namespace="example-namespace",version="1.3.0"} 1

Verification

[juliev0]

Just looking at your PR description screen capture, why is the label for numaflow_controller_running called name_namespace instead of namespace like the others?

[chandankumar4]

Just looking at your PR description screen capture, why is the label for numaflow_controller_running called name_namespace instead of namespace like the others?

Oh, I have updated the code but forgot to update description. Let me do it..