Custom metrics not shown in the list of available metrics

[julian-vp]

Following the examples from documentation
https://flant.github.io/shell-operator/metrics/METRICS_FROM_HOOKS.html#custom-metrics

When adding a metric like below:
echo '{"group":"hook1", "name":"hook_metric", "action":"add", "value":1, "labels":{"kind":"pod"}}' >> $METRICS_PATH

Expected behavior (what you expected to happen):

# HELP hook_metric hook_metric
# TYPE hook_metric counter
hook_metric{hook="hook1.sh", kind="pod"} 1 

Actual behavior (what actually happened):
This custom metric is not visible in the list of metrics under /metrics endpoint

Steps to reproduce:

Environment:

• Shell-operator version:
  shell-operator main-8d7ed98e-2023.12.21_12:27:59
  jqFilter implementation: use embedded libjq-go
• Kubernetes version:
  Tested both in Docker and Kubernetes v1.26.6
• Installation type (kubectl apply, helm chart, etc.):
  Docker

Anything else we should know?:

Additional information for debugging (if necessary):

Dockerfile:

FROM ghcr.io/flant/shell-operator:latest
ADD hooks /hooks

Hook script

if [[ $1 == "--config" ]]; then
  cat <<EOF
configVersion: v1
settings:
  executionMinInterval: 3s
  executionBurst: 3
schedule:
- name: "every 10 seconds"
  crontab: "*/10 * * * * *"
  allowFailure: true
EOF

else

  echo '{"group":"hook1", "name":"hook_metric", "action":"add", "value":1, "labels":{"kind":"pod"}}' >> $METRICS_PATH

fi

Logs

[adberger]

Hook Metrics should be available under the /metrics/hooks endpoint.