Slack newline using {{ if }} in alertmanager

[matthew...@anatwine.com]

I've got a Slack receiver setup in Alertmanager and it uses an if statement to determine if a particular annotation is in use, and if so to change the output. The issue here is that the if statement seems to add a newline and thus makes the Slack message untidy. This is obviously not a huge issue in the grand scheme of things but I'm curious as to whether there is a way around this or if it's an issue with how it generates the output.

This is the relevant part of the receiver config:

    text: >-

     {{ range .Alerts }}

       *Alert:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`

       {{ if ( ne ( .Annotations.description | len ) 0 ) and ( ne ( .Annotations.grafana | len ) 0 ) }}

         *Grafana:* <{{ .Annotations.grafana }}|:chart_with_upwards_trend:>

         *Description:* {{ .Annotations.description }}

       {{ else if ( ne ( .Annotations.grafana | len ) 0 ) and ( eq ( .Annotations.description | len ) 0 ) }}

         *Grafana:* <{{ .Annotations.grafana }}|:chart_with_upwards_trend:>

       {{ else if ( ne ( .Annotations.description | len ) 0 ) and ( eq ( .Annotations.grafana | len ) 0 ) }}

         *Description:* {{ .Annotations.description }}

       {{ end }}

         *Details:*

       {{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`

       {{ end }}

     {{ end }}

and this is what the output looks like:

[Brian Brazil]

On 7 February 2018 at 14:35, <matthew...@anatwine.com> wrote:

I've got a Slack receiver setup in Alertmanager and it uses an if statement to determine if a particular annotation is in use, and if so to change the output. The issue here is that the if statement seems to add a newline and thus makes the Slack message untidy. This is obviously not a huge issue in the grand scheme of things but I'm curious as to whether there is a way around this or if it's an issue with how it generates the output.

Newer versions of Go have a way to make this a bit easier, see https://golang.org/pkg/text/template/#hdr-Text_and_spaces

Brian

 

This is the relevant part of the receiver config:

    text: >-

     {{ range .Alerts }}

       *Alert:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`

       {{ if ( ne ( .Annotations.description | len ) 0 ) and ( ne ( .Annotations.grafana | len ) 0 ) }}

         *Grafana:* <{{ .Annotations.grafana }}|:chart_with_upwards_trend:>

         *Description:* {{ .Annotations.description }}

       {{ else if ( ne ( .Annotations.grafana | len ) 0 ) and ( eq ( .Annotations.description | len ) 0 ) }}

         *Grafana:* <{{ .Annotations.grafana }}|:chart_with_upwards_trend:>

       {{ else if ( ne ( .Annotations.description | len ) 0 ) and ( eq ( .Annotations.grafana | len ) 0 ) }}

         *Description:* {{ .Annotations.description }}

       {{ end }}

         *Details:*

       {{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`

       {{ end }}

     {{ end }}

and this is what the output looks like:

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Brian Brazil

www.robustperception.io

[matthew...@anatwine.com]

Yeah, that's sorted it. Cheers.

Matt

On Wednesday, 7 February 2018 14:37:24 UTC, Brian Brazil wrote:

On 7 February 2018 at 14:35, <matthew...@anatwine.com> wrote:

I've got a Slack receiver setup in Alertmanager and it uses an if statement to determine if a particular annotation is in use, and if so to change the output. The issue here is that the if statement seems to add a newline and thus makes the Slack message untidy. This is obviously not a huge issue in the grand scheme of things but I'm curious as to whether there is a way around this or if it's an issue with how it generates the output.

Newer versions of Go have a way to make this a bit easier, see https://golang.org/pkg/text/template/#hdr-Text_and_spaces

Brian

 

--

Brian Brazil

www.robustperception.io

[wcooley...@gmail.com]

Would you mind posting your updated slack template?