Slack message won't render value

Grafana Alerting
,
1

I am trying to get current value from query in Slack message but unfortunately I am getting {{ humanize $values.A.Value }} instead.

My Slack message template:

{{ define "alert_severity_prefix_emoji" -}}
	{{- if ne .Status "firing" -}}
		:white_check_mark:
	{{- else if eq .CommonLabels.severity "critical" -}}
		:red_circle:
	{{- else if eq .CommonLabels.severity "warning" -}}
		:warning:
	{{- end -}}
{{- end -}}

{{ define "slack.title" -}}
  {{ template "alert_severity_prefix_emoji" . }}
	[{{- .Status | toUpper -}}{{- if eq .Status "firing" }} x {{ .Alerts.Firing | len -}}{{- end }}]: {{ .CommonLabels.alertname -}}
{{- end -}}

{{- define "slack.text" -}}
{{- range .Alerts -}}
{{ if gt (len .Annotations ) 0 }}
*Description*: {{ .Annotations.description }}
*Instance*:
{{ range .Labels.SortedPairs }}{{ if or (eq .Name "env") (eq .Name "instance") }}• {{ .Name }}: `{{ .Value }}`
{{ end }}{{ end }}
*Silence alert*: {{ .SilenceURL }}
*Go to dashboard*: {{ .DashboardURL }}
*Go to panel directly*: {{ .PanelURL }}
{{ end }}
{{ end }}
{{ end }}

Alert configuration:

grafana_1
grafana_11323×855 58 KB

grafana_2
grafana_2746×669 37.7 KB

grafana_3
grafana_31095×682 44.5 KB

grafana_4

what I am doing wrong?

2

Hi! :wave:

You need to use the value of the Classic Condition B. You can’t use the value of A as it is a query and queries can return anywhere between 10s and 10,000s of data points, and Grafana doesn’t know which one you want.

We have some documentation explaining this here Templating labels and annotations | Grafana documentation

3

Hi George,
No, it won’t work either I’ve tried earlier and it was returning <no value> in Slack message. I found the issue. It doesn’t work with classic expressions etc. I managed to make it working by creating two expressions: Reduce and Math:

I wanted to attach a screenshot but unfortunately I am getting: ExternalUploadHelpers::ExternalUploadValidationError error

4

Hi! When using Classic Conditions you need to use the RefID and offset of the condition, as explained here. For example:

The first condition is {{ $values.B0 }}, and the second condition is {{ $values.B1 }}
1 Like
5

Thats useful information! Thanks, I didn’t find it earlier.