error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[0].status

[yurenchen000]

error extracting command arguments: couldn't retrieve argument for {Source:payload Name:ruleName EnvName: Base64Decode:false}
error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[0].status EnvName:status Base64Decode:false}
error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[].labels.alertname EnvName:alertname Base64Decode:false}

seems all argument with array [] are failed

the full request log:

> [a0ea1e] POST /hooks/grafana HTTP/1.1
> [a0ea1e] Host: jk4:7001
> [a0ea1e] Accept-Encoding: gzip
> [a0ea1e] Content-Length: 1206
> [a0ea1e] Content-Type: application/json
> [a0ea1e] User-Agent: Grafana
> [a0ea1e] 
> [a0ea1e] {"receiver":"test","status":"firing","alerts":[{"status":"firing","labels":{"alertname":"TestAlert","instance":"Grafana"},"annotations":{"summary":"Notification test"},"startsAt":"2025-04-04T17:33:47.70415858Z","endsAt":"0001-01-01T00:00:00Z","generatorURL":"","fingerprint":"57c6d9296de2ad39","silenceURL":"http://localhost:3000/alerting/silence/new?alertmanager=grafana\u0026matcher=alertname%3DTestAlert\u0026matcher=instance%3DGrafana","dashboardURL":"","panelURL":"","values":null,"valueString":"[ metric='foo' labels={instance=bar} value=10 ]"}],"groupLabels":{"alertname":"TestAlert","instance":"Grafana"},"commonLabels":{"alertname":"TestAlert","instance":"Grafana"},"commonAnnotations":{"summary":"Notification test"},"externalURL":"http://localhost:3000/","version":"1","groupKey":"test-57c6d9296de2ad39-1743788027","truncatedAlerts":0,"orgId":1,"title":"[FIRING:1] TestAlert Grafana ","state":"alerting","message":"**Firing**\n\nValue: [no value]\nLabels:\n - alertname = TestAlert\n - instance = Grafana\nAnnotations:\n - summary = Notification test\nSilence: http://localhost:3000/alerting/silence/new?alertmanager=grafana\u0026matcher=alertname%3DTestAlert\u0026matcher=instance%3DGrafana\n"}
[webhook] 2025/04/05 01:33:47 [a0ea1e] incoming HTTP POST request from 192.168.5.3:51102
[webhook] 2025/04/05 01:33:47 [a0ea1e] grafana got matched
[webhook] 2025/04/05 01:33:47 [a0ea1e] grafana hook triggered successfully
[webhook] 2025/04/05 01:33:47 [a0ea1e] error extracting command arguments: couldn't retrieve argument for {Source:payload Name:ruleName EnvName: Base64Decode:false}
[webhook] 2025/04/05 01:33:47 [a0ea1e] error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[0].status EnvName:status Base64Decode:false}
[webhook] 2025/04/05 01:33:47 [a0ea1e] error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[].labels.alertname EnvName:alertname Base64Decode:false}
[webhook] 2025/04/05 01:33:47 [a0ea1e] error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[].annotations.summary EnvName:summary Base64Decode:false}
[webhook] 2025/04/05 01:33:47 [a0ea1e] error extracting command arguments for environment: couldn't retrieve argument for {Source:payload Name:alerts[].labels.grafana_folder EnvName:grafana_folder Base64Decode:false}

[yurenchen000]

I haven't found array example in docs

https://github.com/adnanh/webhook/blob/2.8.2/hooks.json.example
https://github.com/adnanh/webhook/wiki/Hook-Examples

after dig the source code
https://github.com/adnanh/webhook/blob/2.8.2/internal/hook/hook.go#L371C19-L371C36

I realized arr[] or arr[0] should be written as arr.0 in webhook.json

       {
         "envname": "status",
         "source": "payload",
-        "name": "alerts[].status"
+        "name": "alerts.0.status"
       },
       {
         "envname": "alertname",
         "source": "payload",
-        "name": "alerts[].labels.alertname"
+        "name": "alerts.0.labels.alertname"
       },

[yurenchen000]

array element ref
#475 (comment)
#531 (comment)

maybe add a exapme about array field?

here is mine for grafana alert notify

webhook.grafana_alert.json

[
  {
    "id": "grafana",
    "execute-command": "/home/chen/wdir/webhook/grafana_alert.sh",
    "command-working-directory": "/home/chen/wdir/webhook",
    "response-message": "Executing webhook alert.sh...",
    "pass-arguments-to-command": [
      {
        "source": "payload",
        "name": "title"
      },
      {
        "source": "payload",
        "name": "message"
      },
      {
        "source": "payload",
        "name": "ruleName"
      }
    ],
    "pass-environment-to-command": [
      {
        "envname": "title",
        "source": "payload",
        "name": "title"
      },
      {
        "envname": "status0",
        "source": "payload",
        "name": "status"
      },
      {
        "envname": "state",
        "source": "payload",
        "name": "state"
      },
      {
        "envname": "status",
        "source": "payload",
        "name": "alerts.0.status"
      },
      {
        "envname": "alertname",
        "source": "payload",
        "name": "alerts.0.labels.alertname"
      },
      {
        "envname": "summary",
        "source": "payload",
        "name": "alerts.0.annotations.summary"
      },
      {
        "envname": "grafana_folder",
        "source": "payload",
        "name": "alerts.0.labels.grafana_folder"
      },
      {
        "envname": "job",
        "source": "payload",
        "name": "alerts.0.labels.job"
      },
      {
        "envname": "instance",
        "source": "payload",
        "name": "alerts.0.labels.instance"
      },
      {
        "envname": "generatorURL",
        "source": "payload",
        "name": "alerts.0.generatorURL"
      },
      {
        "envname": "dashboardURL",
        "source": "payload",
        "name": "alerts.0.dashboardURL"
      },
      {
        "envname": "values",
        "source": "payload",
        "name": "alerts.0.values"
      }
    ],
    "pass-file-to-command": [
      {
        "source": "entire-payload",
        "envname": "fname",
        "base64decode": false
      }
    ],
    "include-command-output-in-response": true
  }
]