Add a Feishu notification example based on JSON webhook.

Signed-off-by: 孙林耀 <[email protected]>

Author: MicroOps-cn

examples/feishu/README.md

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+### Alert
+```json
+[
+  {
+    "labels": {
+      "alertname": "Test Alert Temiydom wgatpelzn eiesvt.",
+      "env": "Test",
+      "group": "Ops",
+      "name": "Teft dwqokj yqka jbroocrw xwz.",
+      "severity": "critical"
+    },
+    "annotations": {
+      "message": "Zxoiyg mnukiqqa imgxyh gwahxoe rixwdzgfn.\"\nLcxdl dpcmu gcrwhvyb qbipfn ifipq omumebq whwmupxag rnbryqneyu gih mszuxf.Tfwbmtj dxuwskbctr ostv kpmxujo tlydykp."
+    },
+    "startsAt": "2023-05-04T03:45:54.173Z",
+    "endsAt": "2023-05-04T04:45:54.173Z",
+    "generatorURL": "https://www.github.com"
+  }
+]
+```
+### Template 
+```gotemplate
+{{- define "feishu.title" -}}
+    {{- if eq .Status "firing" -}}
+        [Firing {{- .Alerts.Firing | len -}}/{{- .Alerts | len -}}]
+    {{- else if eq .Status "resolved" -}}
+        [Resolved {{- .Alerts.Resolved | len -}}]
+    {{- else -}}
+        [{{- .Status | toUpper | safeJson -}}]
+    {{- end -}}
+    {{" "}}{{- range .GroupLabels.SortedPairs -}} {{- if eq .Name "alertname" -}}{{- .Value | safeJson -}}{{- end -}} {{- end -}}
+{{- end -}}
+
+{{- define "feishu.msg" -}}
+    ### {{ template "feishu.title" . -}}\n
+    {{- range $idx,$elem := .Alerts.Firing -}}
+        {{- range .Labels.SortedPairs -}}
+            **{{- .Name | safeJson -}}**:{{" "}}{{- .Value | safeJson -}}\n
+        {{- end -}}
+        {{- range .Annotations.SortedPairs -}}
+            **{{- .Name | safeJson -}}**:{{" "}}{{- .Value | safeJson -}}\n
+        {{- end -}}
+        **Srart Time**:{{" "}}{{- .StartsAt -}}\n
+        {{- if eq .Status "firing" -}}
+            [View data]({{.GeneratorURL | safeJson}})
+        {{- end -}}
+    {{- end -}}
+{{- end -}}
+{{- define "feishu.json" -}}
+    {
+        "msg_type": "interactive",
+        "card": {
+            "elements": [
+                {
+                    "content": "{{- template "feishu.msg" . -}}",
+                    "tag": "markdown"
+                }
+            ],
+            "config": {
+                "wide_screen_mode": true
+            }
+        }
+    }
+{{- end -}}
+
+```
+### Alertmanager Config
+```yaml
+
+receivers:
+  - name: alert_test
+    webhook_configs:
+      - url: 'https://open.feishu.cn/open-apis/bot/v2/hook/xxxxxxxxxxxxx'
+        json: '{{ template "feishu.json" . }}'
+        send_resolved: true
+```
+
+### Webhook Content
+```
+{
+    "msg_type": "interactive",
+    "card": {
+        "elements": [
+            {
+                "content": "### [Firing1/1] Test Alert Temiydom wgatpelzn eiesvt.\n**alertname**: Test Alert Temiydom wgatpelzn eiesvt.\n**env**: Test\n**group**: Ops\n**name**: Teft dwqokj yqka jbroocrw xwz.\n**severity**: critical\n**message**: Zxoiyg mnukiqqa imgxyh gwahxoe rixwdzgfn.\"\nLcxdl dpcmu gcrwhvyb qbipfn ifipq omumebq whwmupxag rnbryqneyu gih mszuxf.Tfwbmtj dxuwskbctr ostv kpmxujo tlydykp.\n**Srart Time**: 2023-05-04 03:45:54.173 +0000 UTC\n[View data](https://www.github.com)",
+                "tag": "markdown"
+            }
+        ],
+        "config": {
+            "wide_screen_mode": true
+        }
+    }
+}
+```
+
+### Feishu message
+![image](./feishu_message.png)

examples/feishu/alertmanager.yml

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+global:
+  resolve_timeout: 5m
+route:
+  group_by: ['alertname']
+  group_wait: 10s
+  group_interval: 10s
+  repeat_interval: 24h
+
+  receiver: 'alert_test'
+
+receivers:
+  - name: alert_test
+    webhook_configs:
+      - url: 'https://open.feishu.cn/open-apis/bot/v2/hook/xxxxxxxxxxxxxxxxxxxxx'
+        json: '{{ template "feishu.json" . }}'
+        send_resolved: true
+
+inhibit_rules:
+  - source_match:
+      severity: 'critical'
+    target_match:
+      severity: 'warning'
+    equal: ['alertname', 'dev', 'instance']
+
+templates:
+  - "json.tmpl"

examples/feishu/feishu_message.png

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+{{- define "feishu.title" -}}
+    {{- if eq .Status "firing" -}}
+        [Firing {{- .Alerts.Firing | len -}}/{{- .Alerts | len -}}]
+    {{- else if eq .Status "resolved" -}}
+        [Resolved {{- .Alerts.Resolved | len -}}]
+    {{- else -}}
+        [{{- .Status | toUpper | safeJson -}}]
+    {{- end -}}
+    {{" "}}{{- range .GroupLabels.SortedPairs -}} {{- if eq .Name "alertname" -}}{{- .Value | safeJson -}}{{- end -}} {{- end -}}
+{{- end -}}
+
+{{- define "feishu.msg" -}}
+    ### {{ template "feishu.title" . -}}\n
+    {{- range $idx,$elem := .Alerts.Firing -}}
+        {{- range .Labels.SortedPairs -}}
+            **{{- .Name | safeJson -}}**:{{" "}}{{- .Value | safeJson -}}\n
+        {{- end -}}
+        {{- range .Annotations.SortedPairs -}}
+            **{{- .Name | safeJson -}}**:{{" "}}{{- .Value | safeJson -}}\n
+        {{- end -}}
+        **Srart Time**:{{" "}}{{- .StartsAt -}}\n
+        {{- if eq .Status "firing" -}}
+            [View data]({{.GeneratorURL | safeJson}})
+        {{- end -}}
+    {{- end -}}
+{{- end -}}
+{{- define "feishu.json" -}}
+    {
+        "msg_type": "interactive",
+        "card": {
+            "elements": [
+                {
+                    "content": "{{- template "feishu.msg" . -}}",
+                    "tag": "markdown"
+                }
+            ],
+            "config": {
+                "wide_screen_mode": true
+            }
+        }
+    }
+{{- end -}}