Sensu Go Email Handler Plugin

TravisCI:

The Sensu Go Email Handler is a Sensu Event Handler for sending
incident notification emails.

Installation

Download the latest version of the sensu-email-handler from releases,
or create an executable script from this source.

From the local path of the sensu-email-handler repository:

go build -o /usr/local/bin/sensu-email-handler main.go

Configuration

Example Sensu Go definition:

{
    "api_version": "core/v2",
    "type": "Handler",
    "metadata": {
        "namespace": "default",
        "name": "email"
    },
    "spec": {
        "type": "pipe",
        "command": "sensu-email-handler -f from@example.com -t to@example.com -s smtp.example.com -u user -p password",
        "timeout": 10,
        "filters": [
            "is_incident",
            "not_silenced"
        ]
    }
}

Usage Examples

Help

The Sensu Go Email handler for sending an email notification

Usage:
  sensu-email-handler [flags]

Flags:
  -T, --bodyTemplateFile string   A template file to use for the body
  -t, --toEmail string            The 'to' email address
  -f, --fromEmail string          The 'from' email address
  -h, --help                      help for sensu-email-handler
  -s, --smtpHost string           The SMTP host to use to send to send email
  -p, --smtpPassword string       The SMTP password, if not in env SMTP_PASSWORD
  -P, --smtpPort uint16           The SMTP server port (default 587)
  -u, --smtpUsername string       The SMTP username, if not in env SMTP_USERNAME
  -H, --hookout                   Include output from check hook(s)
  -i, --insecure                  Use an insecure connection (unauthenticated on port 25)
  -l, --enableLoginAuth           Use "login auth" mechanism
  -S, --subjectTemplate string    A template to use for the subject (default "Sensu Alert - {{.Entity.Name}}/{{.Check.Name}}: {{.Check.State}}")

Annotations

All of the above command line arguments can be overridden by check or entity annotations.
The annotation consists of the key formed by appending the "long" argument specification
to the string sensu.io/plugins/email/config (e.g. sensu.io/plugins/email/config/toEmail).

For example, having the following in an agent.yml file will create an entity annotation
such that emails generated by events on this entity will go to ops@example.com instead
of the recipient defined in the handler. And the subject would be something to the effect
of 'failing - webserver01/check-nginx'.

namespace: "default"
subscriptions:
  - linux
backend-url:
  - "ws://127.0.0.1:8081"
annotations:
  sensu.io/plugins/email/config/toEmail: "ops@example.com"
  sensu.io/plugins/email/config/subjectTemplate: "{{.Check.State}} - {{.Entity.Name}}/{{.Check.Name}}",

Note: When using template expansion for annotations in checks, the token delimiters {{ and }} have to be escaped with {{` and `}}, respectively. Yes, this is ugly, but it is because checks are ran through token expansion before being ran. This is not needed for annotations in entities.

Example:

"sensu.io/plugins/email/config/subjectTemplate": "{{`{{ .Check.State }}`}} - {{`{{ .Entity.Name }}`}}/{{`{{ .Check.Name }}`}}",

Contributing

See https://github.com/sensu/sensu-go/blob/master/CONTRIBUTING.md