How to change Hex-String to String on varbind 3

[gedit5858]

What did you do?
I have two k8s clusters apparently configured exactly the same, however, one sends traps correctly (text string in varbind 3) while the other sends Hex-String in varbind 3.

Where in the SNMP Notifier configuration can I control the varbind 3 string type?

What did you expect to see?
text string in varbind 3
What did you see instead? Under which circumstances?
hex-string. for example. .3 = Hex-STRING:

Environment

• System information:

  insert output of uname -srm here
  Linux 4.14.35-1902.8.4.el7uek.x86_64 x86_64

• SNMP notifier version:
  snmp-notifier:v0.3.0
  insert output of snmp_notifier --version here

• Alertmanager version:

  insert output of alertmanager --version here
  alertmanager:v0.18.0

• Prometheus version:

  insert output of prometheus -version here (if relevant to the issue)

• Alertmanager command line:

insert command line here

• SNMP notifier command line:

insert command line here

• Prometheus alert file:

insert configuration here (if relevant to the issue)

{{- if (len .Alerts) gt 0 -}}
{{- range $severity, $alerts := (groupAlertsByLabel .Alerts "severity") -}}
Status: {{ $severity }}
{{- range $index, $alert := $alerts }}

• Alert: {{ $alert.Labels.alertname }}
  Summary: {{ $alert.Annotations.summary }}
  Description: {{ $alert.Annotations.description }}
  {{ end }}
  {{ end }}
  {{ else -}}
  Status: OK
  {{- end -}}

• Logs:

insert logs relevant to the issue here