在Golang模板中使对象为零

Question

{{ define "default.message" }}
{{- if gt (len .Alerts.Firing) 0 -}}
{{- range $index, $alert := .Alerts.Firing -}}
{{- if eq $index 0 -}}
Detail: {{ $alert.Labels.alertname }}
# Here I'm going to zero $alert
{{- end }}
{{- end }}
{{- end }}
{{- end }}

你好，我想对.Alerts.Firing进行零化，这也是迭代之后的$alert。我刚来金刚，请帮帮忙，谢谢。

补充:实际上它是Prometheus警报的模板。原始日期由alertmanager创建并发送给receiver(微信)。这是微信的模板

    {{ define "wechat.default.message" }}
    {{- if gt (len .Alerts.Firing) 0 -}}
    {{- range $index, $alert := .Alerts.Firing -}}
    {{- if eq $index 0 -}}
    Detail: {{ $alert.Labels.alertname }}
    {{- end }}
    ---- Problem started ------
    Message: {{ $alert.Annotations.description }}
    Time: {{ ($alert.StartsAt.Add 28800e9).Format "2006-01-02 15:04:05" }}
    {{ if gt (len $alert.Labels.instance) 0 }}ip: {{ $alert.Labels.instance }};{{- end }}
    {{- if gt (len $alert.Labels.namespace) 0 }}namespace: {{ $alert.Labels.namespace }};{{- end }}
    {{- if gt (len $alert.Labels.node) 0 }}Node: {{ $alert.Labels.node }};{{- end }}
    {{- if gt (len $alert.Labels.pod_name) 0 }}Pod: {{ $alert.Labels.pod_name }}{{- end }}
    -----------------
    {{ $alert :="" }}
    {{- end }}
    {{- end }}

    {{- if gt (len .Alerts.Resolved) 0 -}}
    {{- range $index, $alert := .Alerts.Resolved -}}
    {{- if eq $index 0 }}

    !!!! Problem resolved !!!!!

    Detail: {{ $alert.Labels.alertname }}

    {{- end }}
    Started_at: {{ ($alert.StartsAt.Add 28800e9).Format "2006-01-02 15:04:05" }}
    Resolved_at: {{ ($alert.StartsAt.Add 28800e9).Format "2006-01-02 15:04:05" }}
    -------
    {{ if gt (len $alert.Labels.instance) 0 -}}ip: {{ $alert.Labels.instance }};{{- end }}
    {{- if gt (len $alert.Labels.namespace) 0 -}}namespace: {{ $alert.Labels.namespace }};{{- end }}
    {{- if gt (len $alert.Labels.node) 0 -}}Node: {{ $alert.Labels.node }};{{- end }}
    {{- if gt (len $alert.Labels.pod_name) 0 -}}Pod: {{ $alert.Labels.pod_name }}{{- end }}
    {{ $alert :="" }}
    -----------------
    {{- end }}
    {{- end }}
    {{- end }}

因此，很难看到alertmanager发送的原始数据。我只能看到的是这个模板所呈现的结果。请看下面的内容。

################# The first  alert #########
##### As we can see 232.20 is in the state of 'resolved' ###

Detail: Node is down
---- Problem started ------
Message: Node is down
  VALUE = 0
  LABELS = 172.16.232.18:9100
Time: 2022-06-02 14:47:51
ip: 172.16.232.18:9100;
-----------------


!!!! Problem resolved !!!!!

Detail: Node is down
Started_at: 2022-06-02 14:47:21
Resolved_at: 2022-06-02 14:47:21
-------
ip: 172.16.232.20:9100;

-----------------

#####################  The second alert    #######
#######  232.20 is still in the state of resolved, it seems it's duplicated， that's why I'm going to zero it ####

!!!! Problem resolved !!!!!

Detail: Node is down
Started_at: 2022-06-02 14:47:51
Resolved_at: 2022-06-02 14:47:51
-------
ip: 172.16.232.18:9100;

-----------------
Started_at: 2022-06-02 14:47:21
Resolved_at: 2022-06-02 14:47:21
-------
ip: 172.16.232.20:9100;

-----------------

补充：

1. 第一警报的原始数据.

[FIRING:1] Node is down (powerdns prod node_exporter critical)
instance is down.
Alerts Firing:
Labels:
 - alertname = Node is down
 - app = powerdns
 - env = prod
 - instance = 172.16.232.18:9100
 - job = node_exporter
 - severity = critical
Annotations:
 - description = Node is down
  VALUE = 0
  LABELS = 172.16.232.18:9100
 - summary = instance is down.
Source: http://pt-prometheus-server-85944ccff6-qvtc4:9090/graph?g0.expr=up%7Bjob%3D%22node_exporter%22%7D+%3D%3D+0&g0.tab=1

Alerts Resolved:
Labels:
 - alertname = Node is down
 - app = powerdns
 - env = prod
 - instance = 172.16.232.20:9100
 - job = node_exporter
 - severity = critical
Annotations:
 - description = Node is down
  VALUE = 0
  LABELS = 172.16.232.20:9100
 - summary = instance is down.
Source: http://pt-prometheus-server-85944ccff6-qvtc4:9090/graph?g0.expr=up%7Bjob%3D%22node_exporter%22%7D+%3D%3D+0&g0.tab=1

AlertmanagerUrl:
http://alertmgr.pacific-textiles.com/#/alerts?receiver=wechat

和

1. 第二警报的原始数据.

[RESOLVED] Node is down (powerdns prod node_exporter critical)
instance is down.

Alerts Resolved:
Labels:
 - alertname = Node is down
 - app = powerdns
 - env = prod
 - instance = 172.16.232.18:9100
 - job = node_exporter
 - severity = critical
Annotations:
 - description = Node is down
  VALUE = 0
  LABELS = 172.16.232.18:9100
 - summary = instance is down.
Source: http://pt-prometheus-server-85944ccff6-qvtc4:9090/graph?g0.expr=up%7Bjob%3D%22node_exporter%22%7D+%3D%3D+0&g0.tab=1
Labels:
 - alertname = Node is down
 - app = powerdns
 - env = prod
 - instance = 172.16.232.20:9100
 - job = node_exporter
 - severity = critical
Annotations:
 - description = Node is down
  VALUE = 0
  LABELS = 172.16.232.20:9100
 - summary = instance is down.
Source: http://pt-prometheus-server-85944ccff6-qvtc4:9090/graph?g0.expr=up%7Bjob%3D%22node_exporter%22%7D+%3D%3D+0&g0.tab=1

AlertmanagerUrl:
http://alertmgr.pacific-textiles.com/#/alerts?receiver=wechat

Answer 1

只要释放它，就不能用零来解析一个对象。因为：

1. 没有办法在微信保存最后的“已解析”主机232.20。
2. 下一次原始数据仍然包含“已解析”主机232.20，因此不能以任何方式删除它。
3. 因此输出也不能更改。

。

谢谢。