├── go.mod ├── .gitignore ├── .github └── demo-new.png ├── detect-misconfig.go ├── Dockerfile ├── README.md ├── main.go └── LICENSE /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/benjojo/alertmanager-discord 2 | 3 | go 1.15 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | alertmanager-discord 2 | alertmanager-discord.darwin 3 | alertmanager-discord.linux 4 | -------------------------------------------------------------------------------- /.github/demo-new.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/benjojo/alertmanager-discord/HEAD/.github/demo-new.png -------------------------------------------------------------------------------- /detect-misconfig.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import "encoding/json" 4 | 5 | type rawPromAlert struct { 6 | Annotations struct { 7 | Description string `json:"description"` 8 | Summary string `json:"summary"` 9 | } `json:"annotations"` 10 | EndsAt string `json:"endsAt"` 11 | GeneratorURL string `json:"generatorURL"` 12 | Labels map[string]string `json:"labels"` 13 | StartsAt string `json:"startsAt"` 14 | Status string `json:"status"` 15 | } 16 | 17 | func isRawPromAlert(b []byte) bool { 18 | alertTest := make([]rawPromAlert, 0) 19 | err := json.Unmarshal(b, &alertTest) 20 | if err == nil { 21 | if len(alertTest) != 0 { 22 | if alertTest[0].Status == "" { 23 | // Ok it's more than likely then 24 | return true 25 | } 26 | } 27 | } 28 | return false 29 | } 30 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | # Built following https://medium.com/@chemidy/create-the-smallest-and-secured-golang-docker-image-based-on-scratch-4752223b7324 2 | 3 | # STEP 1 build executable binary 4 | FROM golang:alpine as builder 5 | # Install SSL ca certificates 6 | RUN apk update && apk add git && apk add ca-certificates 7 | # Create appuser 8 | RUN adduser -D -g '' appuser 9 | COPY . $GOPATH/src/mypackage/myapp/ 10 | WORKDIR $GOPATH/src/mypackage/myapp/ 11 | #get dependancies 12 | RUN go get -d -v 13 | #build the binary 14 | RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags="-w -s" -o /go/bin/alertmanager-discord 15 | 16 | 17 | # STEP 2 build a small image 18 | # start from scratch 19 | FROM scratch 20 | COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ 21 | COPY --from=builder /etc/passwd /etc/passwd 22 | # Copy our static executable 23 | COPY --from=builder /go/bin/alertmanager-discord /go/bin/alertmanager-discord 24 | 25 | ENV LISTEN_ADDRESS=0.0.0.0:9094 26 | EXPOSE 9094 27 | USER appuser 28 | ENTRYPOINT ["/go/bin/alertmanager-discord"] 29 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | alertmanager-discord 2 | === 3 | 4 | Give this a webhook (with the DISCORD_WEBHOOK environment variable) and point it as a webhook on alertmanager, and it will post your alerts into a discord channel for you as they trigger: 5 | 6 | ![](/.github/demo-new.png) 7 | 8 | ## Warning 9 | 10 | This program is not a replacement to alertmanager, it accepts webhooks from alertmanager, not prometheus. 11 | 12 | The standard "dataflow" should be: 13 | 14 | ``` 15 | Prometheus -------------> alertmanager -------------------> alertmanager-discord 16 | 17 | alerting: receivers: 18 | alertmanagers: - name: 'discord_webhook' environment: 19 | - static_configs: webhook_configs: - DISCORD_WEBHOOK=https://discordapp.com/api/we... 20 | - targets: - url: 'http://localhost:9094' 21 | - 127.0.0.1:9093 22 | 23 | 24 | 25 | 26 | 27 | ``` 28 | 29 | ## Example alertmanager config: 30 | 31 | ``` 32 | global: 33 | # The smarthost and SMTP sender used for mail notifications. 34 | smtp_smarthost: 'localhost:25' 35 | smtp_from: 'alertmanager@example.org' 36 | smtp_auth_username: 'alertmanager' 37 | smtp_auth_password: 'password' 38 | 39 | # The directory from which notification templates are read. 40 | templates: 41 | - '/etc/alertmanager/template/*.tmpl' 42 | 43 | # The root route on which each incoming alert enters. 44 | route: 45 | group_by: ['alertname'] 46 | group_wait: 20s 47 | group_interval: 5m 48 | repeat_interval: 3h 49 | receiver: discord_webhook 50 | 51 | receivers: 52 | - name: 'discord_webhook' 53 | webhook_configs: 54 | - url: 'http://localhost:9094' 55 | ``` 56 | 57 | ## Docker 58 | 59 | If you run a fancy docker/k8s infra, you can find the docker hub repo here: https://hub.docker.com/r/benjojo/alertmanager-discord/ 60 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bytes" 5 | "encoding/json" 6 | "flag" 7 | "fmt" 8 | "io/ioutil" 9 | "log" 10 | "net/http" 11 | "net/url" 12 | "os" 13 | "regexp" 14 | "strings" 15 | ) 16 | 17 | // Discord color values 18 | const ( 19 | ColorRed = 0x992D22 20 | ColorGreen = 0x2ECC71 21 | ColorGrey = 0x95A5A6 22 | ) 23 | 24 | type alertManAlert struct { 25 | Annotations struct { 26 | Description string `json:"description"` 27 | Summary string `json:"summary"` 28 | } `json:"annotations"` 29 | EndsAt string `json:"endsAt"` 30 | GeneratorURL string `json:"generatorURL"` 31 | Labels map[string]string `json:"labels"` 32 | StartsAt string `json:"startsAt"` 33 | Status string `json:"status"` 34 | } 35 | 36 | type alertManOut struct { 37 | Alerts []alertManAlert `json:"alerts"` 38 | CommonAnnotations struct { 39 | Summary string `json:"summary"` 40 | } `json:"commonAnnotations"` 41 | CommonLabels struct { 42 | Alertname string `json:"alertname"` 43 | } `json:"commonLabels"` 44 | ExternalURL string `json:"externalURL"` 45 | GroupKey string `json:"groupKey"` 46 | GroupLabels struct { 47 | Alertname string `json:"alertname"` 48 | } `json:"groupLabels"` 49 | Receiver string `json:"receiver"` 50 | Status string `json:"status"` 51 | Version string `json:"version"` 52 | } 53 | 54 | type discordOut struct { 55 | Content string `json:"content"` 56 | Embeds []discordEmbed `json:"embeds"` 57 | } 58 | 59 | type discordEmbed struct { 60 | Title string `json:"title"` 61 | Description string `json:"description"` 62 | Color int `json:"color"` 63 | Fields []discordEmbedField `json:"fields"` 64 | } 65 | 66 | type discordEmbedField struct { 67 | Name string `json:"name"` 68 | Value string `json:"value"` 69 | } 70 | 71 | const defaultListenAddress = "127.0.0.1:9094" 72 | 73 | var ( 74 | whURL = flag.String("webhook.url", os.Getenv("DISCORD_WEBHOOK"), "Discord WebHook URL.") 75 | listenAddress = flag.String("listen.address", os.Getenv("LISTEN_ADDRESS"), "Address:Port to listen on.") 76 | ) 77 | 78 | func checkWhURL(whURL string) { 79 | if whURL == "" { 80 | log.Fatalf("Environment variable 'DISCORD_WEBHOOK' or CLI parameter 'webhook.url' not found.") 81 | } 82 | _, err := url.Parse(whURL) 83 | if err != nil { 84 | log.Fatalf("The Discord WebHook URL doesn't seem to be a valid URL.") 85 | } 86 | 87 | re := regexp.MustCompile(`https://discord(?:app)?.com/api/webhooks/[0-9]{18,19}/[a-zA-Z0-9_-]+`) 88 | if ok := re.Match([]byte(whURL)); !ok { 89 | log.Printf("The Discord WebHook URL doesn't seem to be valid.") 90 | } 91 | } 92 | 93 | func sendWebhook(amo *alertManOut) { 94 | groupedAlerts := make(map[string][]alertManAlert) 95 | 96 | for _, alert := range amo.Alerts { 97 | groupedAlerts[alert.Status] = append(groupedAlerts[alert.Status], alert) 98 | } 99 | 100 | for status, alerts := range groupedAlerts { 101 | DO := discordOut{} 102 | 103 | RichEmbed := discordEmbed{ 104 | Title: fmt.Sprintf("[%s:%d] %s", strings.ToUpper(status), len(alerts), amo.CommonLabels.Alertname), 105 | Description: amo.CommonAnnotations.Summary, 106 | Color: ColorGrey, 107 | Fields: []discordEmbedField{}, 108 | } 109 | 110 | if status == "firing" { 111 | RichEmbed.Color = ColorRed 112 | } else if status == "resolved" { 113 | RichEmbed.Color = ColorGreen 114 | } 115 | 116 | if amo.CommonAnnotations.Summary != "" { 117 | DO.Content = fmt.Sprintf(" === %s === \n", amo.CommonAnnotations.Summary) 118 | } 119 | 120 | for _, alert := range alerts { 121 | realname := alert.Labels["instance"] 122 | if strings.Contains(realname, "localhost") && alert.Labels["exported_instance"] != "" { 123 | realname = alert.Labels["exported_instance"] 124 | } 125 | 126 | RichEmbed.Fields = append(RichEmbed.Fields, discordEmbedField{ 127 | Name: fmt.Sprintf("[%s]: %s on %s", strings.ToUpper(status), alert.Labels["alertname"], realname), 128 | Value: alert.Annotations.Description, 129 | }) 130 | } 131 | 132 | DO.Embeds = []discordEmbed{RichEmbed} 133 | 134 | DOD, _ := json.Marshal(DO) 135 | http.Post(*whURL, "application/json", bytes.NewReader(DOD)) 136 | } 137 | } 138 | 139 | func sendRawPromAlertWarn() { 140 | badString := `This program is suppose to be fed by alertmanager.` + "\n" + 141 | `It is not a replacement for alertmanager, it is a ` + "\n" + 142 | `webhook target for it. Please read the README.md ` + "\n" + 143 | `for guidance on how to configure it for alertmanager` + "\n" + 144 | `or https://prometheus.io/docs/alerting/latest/configuration/#webhook_config` 145 | 146 | log.Print(`/!\ -- You have misconfigured this software -- /!\`) 147 | log.Print(`--- -- -- ---`) 148 | log.Print(badString) 149 | 150 | DO := discordOut{ 151 | Content: "", 152 | Embeds: []discordEmbed{ 153 | { 154 | Title: "You have misconfigured this software", 155 | Description: badString, 156 | Color: ColorGrey, 157 | Fields: []discordEmbedField{}, 158 | }, 159 | }, 160 | } 161 | 162 | DOD, _ := json.Marshal(DO) 163 | http.Post(*whURL, "application/json", bytes.NewReader(DOD)) 164 | } 165 | 166 | func main() { 167 | flag.Parse() 168 | checkWhURL(*whURL) 169 | 170 | if *listenAddress == "" { 171 | *listenAddress = defaultListenAddress 172 | } 173 | 174 | log.Printf("Listening on: %s", *listenAddress) 175 | log.Fatalf("Failed to listen on HTTP: %v", 176 | http.ListenAndServe(*listenAddress, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { 177 | log.Printf("%s - [%s] %s", r.Host, r.Method, r.URL.RawPath) 178 | 179 | b, err := ioutil.ReadAll(r.Body) 180 | if err != nil { 181 | panic(err) 182 | } 183 | 184 | amo := alertManOut{} 185 | err = json.Unmarshal(b, &amo) 186 | if err != nil { 187 | if isRawPromAlert(b) { 188 | sendRawPromAlertWarn() 189 | return 190 | } 191 | 192 | if len(b) > 1024 { 193 | log.Printf("Failed to unpack inbound alert request - %s...", string(b[:1023])) 194 | 195 | } else { 196 | log.Printf("Failed to unpack inbound alert request - %s", string(b)) 197 | } 198 | 199 | return 200 | } 201 | 202 | sendWebhook(&amo) 203 | }))) 204 | } 205 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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