Remove default vars from custom K8s prometheus exporter - kubernetes

Question

I'm starting playing with custom exporters(Using kubernetes,grafana and prometheus) and I have a problem. I managed to expose my metrics correctly but every time I kill the pod that is sending them, the vars change and grafana plots a different colour(like a new info).
Is there any way to only keep app as var, I think that the problem are the vars that change(pod name and ip)?
MyMetric{app="prometheus-export-mymetric",instance="172.26.32.69:3000",job="kubernetes-pods",kubernetes_namespace="default",kubernetes_pod_name="prometheus-export-mymetric-66694564b8-r4pqc",pod_template_hash="66694564b8"}
Thanks in advance.

Answer 1

instead of kubernetes_pod_name you shall use pod labels that stay the same after redeploying.
in prometheus config we are using something like this:
- job_name: kubernetes-pods
honor_timestamps: true
scrape_interval: 15s
scrape_timeout: 10s
metrics_path: /metrics
scheme: http
kubernetes_sd_configs:
- role: pod
relabel_configs:
- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
separator: ;
regex: "true"
replacement: $1
action: keep
- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
separator: ;
regex: (.+)
target_label: __metrics_path__
replacement: $1
action: replace
- source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
separator: ;
regex: ([^:]+)(?::\d+)?;(\d+)
target_label: __address__
replacement: $1:$2
action: replace
- separator: ;
regex: __meta_kubernetes_pod_label_(.+)
replacement: $1
action: labelmap
- source_labels: [__meta_kubernetes_namespace]
separator: ;
regex: (.*)
target_label: kubernetes_namespace
replacement: $1
action: replace
- source_labels: [__meta_kubernetes_pod_name]
separator: ;
regex: (.*)
target_label: kubernetes_pod_name
replacement: $1
action: replace