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Pass color as template var for discord notifier #3675

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2 changes: 2 additions & 0 deletions config/notifiers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ var (
},
Title: `{{ template "discord.default.title" . }}`,
Message: `{{ template "discord.default.message" . }}`,
Color: `{{ template "discord.default.color" . }}`,
}

// DefaultEmailConfig defines default values for Email configurations.
Expand Down Expand Up @@ -221,6 +222,7 @@ type DiscordConfig struct {

Title string `yaml:"title,omitempty" json:"title,omitempty"`
Message string `yaml:"message,omitempty" json:"message,omitempty"`
Color string `yaml:"color,omitempty" json:"color,omitempty"`
}

// UnmarshalYAML implements the yaml.Unmarshaler interface.
Expand Down
3 changes: 3 additions & 0 deletions docs/configuration.md
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Expand Up @@ -678,6 +678,9 @@ webhook_url: <secret>
# Message body template.
[ message: <tmpl_string> | default = '{{ template "discord.default.message" . }}' ]

# Color of message frame.
[ color: <tmpl_string> | default = '{{ template "discord.default.color" . }}' ]

# The HTTP client's configuration.
[ http_config: <http_config> | default = global.http_config ]
```
Expand Down
18 changes: 2 additions & 16 deletions notify/discord/discord.go
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Expand Up @@ -22,7 +22,6 @@ import (
"github.com/go-kit/log"
"github.com/go-kit/log/level"
commoncfg "github.com/prometheus/common/config"
"github.com/prometheus/common/model"

"github.com/prometheus/alertmanager/config"
"github.com/prometheus/alertmanager/notify"
Expand All @@ -37,12 +36,6 @@ const (
maxDescriptionLenRunes = 4096
)

const (
colorRed = 0x992D22
colorGreen = 0x2ECC71
colorGrey = 0x95A5A6
)

// Notifier implements a Notifier for Discord notifications.
type Notifier struct {
conf *config.DiscordConfig
Expand Down Expand Up @@ -78,7 +71,7 @@ type webhook struct {
type webhookEmbed struct {
Title string `json:"title"`
Description string `json:"description"`
Color int `json:"color"`
Color string `json:"color,omitempty"`
}

// Notify implements the Notifier interface.
Expand All @@ -90,7 +83,6 @@ func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error)

level.Debug(n.logger).Log("incident", key)

alerts := types.Alerts(as...)
data := notify.GetTemplateData(ctx, n.tmpl, as, n.logger)
tmpl := notify.TmplText(n.tmpl, data, &err)
if err != nil {
Expand All @@ -112,13 +104,7 @@ func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error)
level.Warn(n.logger).Log("msg", "Truncated message", "key", key, "max_runes", maxDescriptionLenRunes)
}

color := colorGrey
if alerts.Status() == model.AlertFiring {
color = colorRed
}
if alerts.Status() == model.AlertResolved {
color = colorGreen
}
color := tmpl(n.conf.Color)

w := webhook{
Embeds: []webhookEmbed{{
Expand Down
9 changes: 9 additions & 0 deletions template/default.tmpl
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Expand Up @@ -134,6 +134,15 @@ Alerts Resolved:
{{ template "__text_alert_list" .Alerts.Resolved }}
{{ end }}
{{ end }}
{{ define "discord.default.color" }}
{{ if gt (len .Alerts.Firing) 0 }}
10038562

@ultrotter ultrotter Oct 16, 2026

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Can we have a comment here what color it is, please?

@arsalanyavari arsalanyavari Oct 16, 2026

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It's dark red (#992D22 / 0x992D22), which was the original colorRed constant in discord.go.
Will definitely add a clarifying comment like {{/* Red: #992D22 */}} during the rebase.

{{ else if gt (len .Alerts.Resolved) 0 }}
3066993
{{ else }}
9807270
{{ end }}
{{ end }}

{{ define "webex.default.message" }}{{ .CommonAnnotations.SortedPairs.Values | join " " }}
{{ if gt (len .Alerts.Firing) 0 }}
Expand Down