I'm not that familiar with SNS, but as far as Alertmanager is concerned,
isn't it just sending a message to the SNS topic with the message in the
template? The actual email notification format is something that is
configured in AWS? I'm just looking at their FAQ *What are the different
delivery formats/transports for receiving notifications? *
https://aws.amazon.com/sns/faqs/
Perhaps you are using Email-JSON? If the message from Alertmanager contains
YAML, I presume that YAML will be embedded in the JSON.
On Wednesday, March 19, 2025 at 10:27:37 AM UTC João Coelho wrote:
> In my Prometheus configuration file, I have the alertmanager_config
> section, which includes routes, receivers, and template. However, I'm
> facing an issue where the notification emails are always "the same", and in
> JSON format, regardless of the template I use or whether templates are
> defined. Can you help me with this? Is it possible to receive plain text
> notifications with SNS? Am I missing something?
>
> Here's my Prometheus config:
> alert_manager_definition = <<-EOT
> template_files:
> default_template: |
> {{ define "sns.default.message" }}"receiver": "{{ .Receiver }}"{{ end }}
> {{ define "sns.default.subject" }}[{{ .Status | toUpper }}{{ if eq .Status
> "firing" }}:{{ .Alerts.Firing | len }}{{ end }}]{{ end }}
> {{ define "__alertmanager" }}AlertManager{{ end }}
> {{ define "__alertmanagerURL" }}{{ .ExternalURL }}/#/alerts?receiver={{
> .Receiver | urlquery }}{{ end }}
> alertmanager_config: |
> global:
> templates:
> - 'default_template'
> route:
> receiver: test-grafana
> group_wait: 30s
> group_interval: 5m
> repeat_interval: 10m
> group_by: [environment, alertname]
> routes:
> - receiver: 'grafana-test'
> group_wait: 10s
> matchers:
> - alert_group="node_exporter"
> - receiver: 'test-grafana'
> group_wait: 10s
> matchers:
> - alert_group="otelcol"
> receivers:
> - name: 'test-grafana'
> sns_configs:
> - topic_arn: my-sns-topic
> sigv4:
> region: eu-central-1
> - name: 'grafana-test'
> sns_configs:
> - topic_arn: my-sns-topic
> sigv4:
> region: eu-central-1
> EOT
>
> Also tried somethings like these already:
> alert_manager_definition = <<-EOT
> alertmanager_config: |
> route:
> receiver: test-grafana
> group_wait: 30s
> group_interval: 5m
> repeat_interval: 10m
> group_by: [environment, alertname]
> routes:
> - receiver: 'grafana-test'
> group_wait: 10s
> matchers:
> - alert_group="node_exporter"
> - receiver: 'test-grafana'
> group_wait: 10s
> matchers:
> - alert_group="otelcol"
> receivers:
> - name: 'test-grafana'
> sns_configs:
> - topic_arn: my-sns-topic
> sigv4:
> region: eu-central-1
> - name: 'grafana-test'
> sns_configs:
> - topic_arn: my-sns-topic
> sigv4:
> region: eu-central-1
> EOT
>
> alert_manager_definition = <<-EOT
> alertmanager_config: |
> route:
> receiver: test-grafana
> group_wait: 30s
> group_interval: 5m
> repeat_interval: 10m
> group_by: [environment, alertname]
> routes:
> - receiver: 'grafana-test'
> group_wait: 10s
> matchers:
> - alert_group="custom_exporter"
> - receiver: 'test-grafana'
> group_wait: 10s
> matchers:
> - alert_group="otelcol"
> receivers:
> - name: 'test-grafana'
> sns_configs:
> - topic_arn: my-sns-topic
> message: 'There are {{ len .Alerts.Firing }} firing alerts, and {{ len
> .Alerts.Resolved }} resolved alerts'
> sigv4:
> region: eu-central-1
> attributes:
> test-am: prometheus
> - name: 'grafana-test'
> sns_configs:
> - topic_arn: my-sns-topic
> sigv4:
> region: eu-central-1
> attributes:
> test-am: amprometheus
> EOT
>
> For all configs showed above, the email notification was alwyas the same,
> in Json format.
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