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Put each destination in a Prometheus alert-rule annotation, then render the annotation in the Alertmanager receiver that sends the notification. Use .CommonAnnotations when every alert in a notification group shares the same link; iterate through .Alerts and use each alert’s .Annotations when links differ. The annotation-to-template handoff is universal; the format of a logs or traces URL is not. Construct those URLs for the observability system you actually use.
How the link handoff works
There are two separate template stages. Prometheus evaluates annotation templates while processing an alert rule. Its alert variables, such as $labels and $value, let a rule build an annotation value from alert context. Alertmanager then receives those annotations as notification data. The receiver’s notification template decides which values to include in the outgoing message.
- Prometheus creates the values. An alert rule defines annotations such as
runbook_url,logs_url, andtraces_url. An annotation can be a fixed URL or a URL constructed from alert variables, provided the destination supports the resulting URL format. - Alertmanager groups alerts. A notification can contain more than one alert. Some annotation values may be common to the whole group; others may vary for each alert.
- The receiver formats the message. A Slack, email, or other receiver template renders the values into the format that its destination accepts. A generic webhook instead receives a structured notification payload that its recipient can transform or display.
Annotations are the right place for this handoff: Prometheus documents them for longer informational content, including descriptions and runbook links. Adding an annotation does not create a dashboard, query, or trace. It only stores the value that a later notification template can render.
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Think of the annotation as the bridge between the alert rule and the notification, not as a command to the observability product. The rule supplies a destination string; the product’s UI determines what that destination opens. If a link needs a service name, query, or time range, the annotation must contain a URL that the product recognizes with that context. If the product has no documented deep-link format for a view, Alertmanager cannot supply one on its behalf.
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Add destinations to a Prometheus alert rule
Choose stable annotation keys and use them consistently across rules. The following shows the shape of a rule; the host, route, and query parameters are illustrative. Replace them with real destinations and the URL format documented by your logs or tracing system.
- alert: ApiHighErrorRate
expr: ...
annotations:
summary: "High error rate for {{ $labels.service }}"
runbook_url: "https://ops.example.com/runbooks/api-high-error-rate"
logs_url: "https://observability.example.com/logs?service={{ $labels.service }}"
traces_url: "https://observability.example.com/traces?service={{ $labels.service }}"Keep the rule’s responsibilities narrow: it can select a destination using labels and values, but it is not a universal URL builder for every observability product. The product-specific part is the destination’s supported URL syntax and the context its page requires, such as a service, query, or time range. Do not assume that a path or parameter accepted by one stack will work in another.
Use a fixed link when the destination is shared
A service’s runbook is often stable across alert instances, so a fixed URL can be clearer and less fragile than a constructed one. If every alert in a group points to the same runbook or landing page, the receiver can render that shared annotation directly.
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A static destination is especially useful when the best next step is a general procedure rather than a pre-filtered diagnostic view. It also reduces the number of assumptions embedded in a rule: the runbook remains the destination even when the values or labels associated with an individual alert change. Review the destination as part of runbook maintenance so that a moved page does not leave notifications pointing to an obsolete location.
Template a link only when alert context adds value
Prometheus can evaluate rule annotations with alert variables such as $labels and $value. This can produce a destination keyed to a service or other alert label, but it does not guarantee that the resulting URL is valid for the target system. Check the product’s documented deep-link format and encode variable values appropriately for its URL rules. Avoid placing complex query construction in the alert rule; Prometheus’s template examples point toward linking to a console for more complicated needs.
Keep the rendered URL readable and test it with representative label values, including values with spaces, slashes, ampersands, or other characters that may need encoding. A link that works for a simple service name may break when a real label contains reserved URL characters.
Use a templated destination when the additional context makes the responder’s first step meaningfully faster—for example, opening a view already scoped to the alert’s service. Before adopting that pattern, check that the referenced label is present and has the intended value for every alert produced by the rule. A missing or unexpected label can leave a URL incomplete or point it at the wrong view. Keep the rule annotation simple enough that an operator can inspect the rendered result without having to reverse-engineer a large expression.
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Render shared annotation values in a notification
Alertmanager’s notification data exposes annotations common to a notification group through .CommonAnnotations. A receiver can render those fields when the values truly are shared. For example, a Slack receiver’s message field can be written like this:
receivers:
- name: service-alerts
slack_configs:
- channel: '#alerts'
text: >-
{{ .CommonAnnotations.summary }}
Runbook: {{ .CommonAnnotations.runbook_url }}
Logs: {{ .CommonAnnotations.logs_url }}
Traces: {{ .CommonAnnotations.traces_url }}This is a configuration shape, not a tested drop-in configuration. Confirm the receiver field and formatting against the deployed Alertmanager version and destination. In particular, a receiver may display a URL as plain text rather than as a clickable link, or may have its own formatting requirements.
Know when a common value is absent
.CommonAnnotations contains the values shared across the group. When alerts have different values for a key, that key is not a reliable place to retrieve a per-alert destination. Do not use a shared-value template on the assumption that every alert in the group has identical runbook, logs, or trace links. Either arrange grouping so the values are common, or render each alert separately.
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Render different links for each alert
When the alerts in a notification have distinct annotation values, iterate through .Alerts and print each alert’s own annotations alongside identifying labels. Alertmanager’s notification examples use this pattern to show per-alert annotations.
{{ range .Alerts }}
Alert: {{ .Labels.alertname }}
Service: {{ .Labels.service }}
Runbook: {{ .Annotations.runbook_url }}
Logs: {{ .Annotations.logs_url }}
Traces: {{ .Annotations.traces_url }}
{{ end }}Choose the fields that help the recipient distinguish alerts; a service label is only useful if your rules actually set it. If one notification contains many alerts, include enough context to map each set of links to its alert, rather than printing a block of URLs with no identifiers. A per-alert template is also useful when a single group legitimately includes several services.
Per-alert output trades brevity for precision. It may repeat a shared runbook link alongside several alert-specific log or trace links, but it avoids implying that one alert’s destination is appropriate for its neighbors. If the receiver’s message format supports sections or clear separators, use them to make each alert and its links easy to scan. The essential requirement is that every destination remain visibly associated with the alert labels that explain what it concerns.
| Approach | Use it when | Trade-off |
|---|---|---|
.CommonAnnotations |
The destination value is shared by all alerts in the notification group. | Concise message, but it cannot preserve links that differ among alerts. |
Range over .Alerts |
Each alert may have its own annotation values. | Preserves alert-specific links, but the message needs enough structure to associate links with the right alert. |
Use a reusable template or webhook when formatting grows
A short message can be rendered directly in a receiver field. For longer or repeated formatting, Alertmanager can load reusable templates through its templates configuration and a receiver field can invoke a named template. The receiver’s text field can call a named template with the notification data, for example:
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templates:
- 'templates/notifications.tmpl'
receivers:
- name: service-alerts
slack_configs:
- channel: '#alerts'
text: '{{ template "service-alerts" . }}'The file path and template name above are illustrative configuration values. Define the named template in the configured file using Alertmanager’s supported template syntax, and pass the notification data (shown as .) so the template can access common annotations or individual alerts. This separates message layout from receiver configuration and makes it easier to keep a consistent format across receivers.
An inline template is convenient while the message is small and unique to one receiver. A named template is a better fit when the same layout is reused or when a long body would make receiver configuration difficult to maintain. In either case, the template still needs to make the same choice between group-common values and per-alert values; moving the formatting into a file does not change the notification data or its grouping behavior.
For a generic webhook, Alertmanager sends a structured notification payload, including annotation data and backlink fields. The webhook consumer can render or transform that payload for its destination. Use a webhook when the recipient needs structured data or custom transformation; it adds a consumer-side step that a built-in receiver’s template may avoid.
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|---|---|---|
| Inline receiver template | A small, receiver-specific message. | Formatting lives in the receiver configuration and may be repeated. |
| Named template file | Longer or reusable notification layouts. | Configure and maintain the template file and invoke the correct named template. |
| Generic webhook | A recipient needs the structured payload or custom formatting. | The webhook consumer must interpret and present the fields appropriately. |
Keep alert links distinct from Alertmanager backlinks
Alertmanager exposes ExternalURL and GeneratorURL, but they serve different purposes from the annotations described above. ExternalURL is a backlink to the Alertmanager instance. GeneratorURL identifies the entity that generated the alert. Neither is automatically a link to an operational runbook, a logs view, or an application trace.
Include those built-in links when they help a recipient navigate to Alertmanager or the alert’s origin, but do not label them as runbook, logs, or trace destinations. Keep the three kinds of destination explicit in your annotation keys and message labels so an on-call reader knows what each link opens.
This distinction matters when a notification already contains a link labeled “source” or a backlink supplied by Alertmanager. Such a link can be useful for investigating the alert’s origin, but it is not interchangeable with an operational procedure or a product-specific diagnostic view. If responders need all of these destinations, render each under an accurate label rather than expecting one built-in URL to stand in for the others.
Do not confuse application trace links with Alertmanager tracing
Alertmanager also has an optional tracing configuration for instrumenting Alertmanager’s own distributed tracing. Its settings concern how Alertmanager emits or transports its own trace data, including endpoint, sampling fraction, transport, TLS, compression, and timeout.
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That configuration does not inject a link to an application trace into an alert notification. To give responders an application trace destination, put the URL in an alert annotation and render that annotation in the receiver template. The distinction is about what is being traced: Alertmanager’s processing versus the application activity that prompted an alert.
Validate the notification before relying on it
Prometheus rule annotations and Alertmanager notification templates run in different contexts, so validate both sides. A syntactically valid rule can still generate an unusable URL, and a correctly rendered annotation can still be omitted or displayed poorly by a receiver.
- Check the rule values. Confirm that the alert rule defines the expected annotation keys and that any templated labels or values resolve for the alert. Inspect the generated destination with representative label values.
- Check the grouping behavior. Determine whether alerts arriving together share each destination. Use common annotation rendering only for values that are common; otherwise use the per-alert form.
- Check the receiver output. Confirm that the message includes the intended annotation values, associates per-alert links with the right alert, and renders URLs in a usable way for the target channel.
- Check destination access. Open the links from the environment and account the intended recipients will use. Internal systems may be inaccessible to people outside the network or without the necessary permissions.
- Check changes through your normal operations process. Alertmanager documentation describes configuration reload through SIGHUP or an HTTP POST to
/-/reload. Verify that the deployed version supports the method you intend to use and follow the production change process before reloading.
Test both a notification where all relevant values are common and one where at least one value varies, if both patterns can occur in your alert groups. This catches a subtle failure: a template may appear correct with a single alert, then omit or misassociate links when grouping combines alerts with different annotations. Also check the actual message in the destination channel, since template output and receiver rendering are separate parts of the delivery path.
Alertmanager configuration reload options and operational procedures can vary with the deployed setup. The documented SIGHUP and /-/reload mechanisms are not a substitute for checking the version and the organization’s rollout process. Treat a notification template change like any other production configuration change: verify the intended output and use the supported reload path.
Common failures and how to correct them
The notification shows a blank link
Check the annotation key spelling in both the alert rule and receiver template. Then check whether the template is reading a common value that is not shared across the group. If the value differs per alert, switch to iterating over .Alerts and reading .Annotations.
The link opens the wrong service or time window
Inspect the final rendered URL rather than only the template expression. The target observability product determines the correct query and time-window URL format; Alertmanager does not infer it. Adjust the URL construction to that product’s documented format and verify that its parameters use the intended alert context.
The link works for some label values but not others
Check URL encoding for the actual label contents. Characters that are harmless in a simple example can alter query parameters or paths when a real value is inserted. Encode values according to the destination’s URL requirements, and keep template logic simple enough that the final URL can be inspected.
Recipients cannot open an internal destination
Confirm that recipients have network access and authorization for the linked runbook, log system, or tracing system. If the alert is delivered to a broader audience, choose a destination available to that audience or make the access constraint clear in the notification. A clickable URL is not useful if the recipient cannot reach the system.
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This is a receiver-formatting issue, not an annotation issue. Review the destination’s message syntax and the receiver field’s escaping behavior. Alertmanager templates can be evaluated as text or HTML, which affects escaping; treat annotation content as supplied text and use the appropriate output context rather than assuming raw text is safe or automatically linkified.
Security and maintenance considerations
- Treat annotation values as untrusted text. Values can originate in configuration or alert context. Consider escaping and the receiver’s rendering mode, especially if a message is interpreted as HTML.
- Do not put secrets in query parameters. URLs may be visible to notification recipients or retained by systems that process the message. Use access controls at the destination rather than embedding credentials in the link.
- Keep destinations maintainable. Prefer stable runbook URLs and a consistent annotation-key convention. If a product’s URL format changes, update and validate the rules that construct those links.
- Match visibility to the audience. A notification sent outside the team’s trusted environment should not expose a private destination or sensitive query context unless recipients are authorized to see it.
There is no universal logs or traces link recipe established by the Prometheus and Alertmanager annotation mechanism. The reliable division of work is to define the destination according to the observability product, carry it as an alert annotation, and render it in the notification context that matches how alerts are grouped.
Frequently Asked Questions
How do I add a runbook link to an Alertmanager notification?
Add a runbook_url annotation to the Prometheus alert rule, then render it in the receiver template. Use .CommonAnnotations.runbook_url if the link is shared by the notification group, or each alert’s .Annotations.runbook_url inside a range over .Alerts if links differ.
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How do I include logs and traces in Prometheus alerts?
Add log and trace destinations as alert-rule annotations, such as logs_url and traces_url, and include those values in the Alertmanager notification template. Construct each URL using the format supported by your observability product; the annotation mechanism does not create a query or trace view automatically.
How do I use alert annotations in a Slack notification?
In a Slack receiver’s message field, render the annotation values with Alertmanager template expressions. Use .CommonAnnotations for values shared by the group; otherwise range over .Alerts and print each alert’s labels and .Annotations so readers can tell which links go with which alert. Check Slack receiver formatting to confirm links display as intended.
What is the difference between ExternalURL and GeneratorURL?
ExternalURL is a backlink to the Alertmanager instance. GeneratorURL identifies the entity that generated the alert. Neither automatically points to a runbook, logs view, or application trace; add those destinations as alert annotations.
The Bottom Line
Put runbook, logs, and trace destinations in Prometheus alert annotations, then render them with the Alertmanager template that fits the grouping: common annotations for genuinely shared links, or per-alert annotations when destinations vary. Build diagnostic URLs for the observability product, and verify the rendered output, receiver formatting, and recipient access before relying on the links.
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