PMM HA pmm stateful set name differs from names in haproxy configmap

[ihanick]

haproxy configuration assumes that pmm pod names are pmm-0, pmm-1, pmm-2, but statefulset name is pmm-pmm-ha

StatefulSet name generated from:

  name: {{ include "pmm.fullname" . }}

{{- define "pmm.fullname" -}}
{{- if .Values.fullnameOverride }}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.nameOverride }}
{{- if contains $name .Release.Name }}
{{- .Release.Name | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: pmm-pmm-ha
  labels:
    helm.sh/chart: pmm-ha-1.3.23
    app.kubernetes.io/name: pmm-ha
    app.kubernetes.io/instance: pmm
    app.kubernetes.io/component: pmm-server
...
---
# Source: pmm-ha/templates/haproxy-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: pmm-haproxy
  namespace: pmm3
  labels:
    app.kubernetes.io/name: haproxy
    app.kubernetes.io/instance: pmm
    app.kubernetes.io/managed-by: Helm
data:
  haproxy.cfg: |
...
    backend https_back
        option httpchk
        http-check send meth GET uri /v1/server/leaderHealthCheck ver HTTP/1.1 hdr Host www
        http-check expect status 200
        server pmm-0-https pmm-0.monitoring-service.pmm3.svc.cluster.local:8443 check ssl verify none resolvers k8s init-addr last,libc,none
        server pmm-1-https pmm-1.monitoring-service.pmm3.svc.cluster.local:8443 check ssl verify none resolvers k8s init-addr last,libc,none
        server pmm-2-https pmm-2.monitoring-service.pmm3.svc.cluster.local:8443 check ssl verify none resolvers k8s init-addr last,libc,none
...

So, it's possible to set fullnameOverride: "pmm" under values.yaml to make it working.
Could you make haproxy working if override is not defined?