Add support hours documentation to on-call routing rules

content/en/incident_response/on-call/_index.md

@@ -25,7 +25,7 @@ Datadog On-Call integrates monitoring, paging, and incident response into one pl
 
 - **Pages** represent something to get alerted for, such as a monitor, incident, or security signal. A Page can have a status of `Triggered`, `Acknowledged`, or `Resolved`.
 - **Teams** are groups configured within Datadog to handle specific types of Pages, based on expertise and operational roles.
-- **Routing rules** allow Teams to finely adjust their reactions to specific types of incoming events. These rules can set a Page's urgency level and route Pages to different escalation policies depending on the event's metadata.
+- **Routing rules** allow Teams to finely adjust their reactions to specific types of incoming events. These rules can set a Page's urgency level, route Pages to different escalation policies depending on the event's metadata, and configure [support hours][7] to delay escalation notifications to defined time windows.
 - **Escalation policies** determine how Pages are escalated within or across Teams.
 - **Schedules** set timetables for when specific Team members are on-call to respond to Pages.
 
@@ -106,3 +106,4 @@ On-Call is a seat-based SKU. To learn more about how On-Call is billed and how t
 [4]: /account_management/rbac/#role-based-access-control
 [5]: https://www.datadoghq.com/pricing/?product=incident-response#products
 [6]: /account_management/billing/incident_response/
+[7]: /incident_response/on-call/routing_rules#support-hours

content/en/incident_response/on-call/routing_rules.md

@@ -23,6 +23,10 @@ With routing rules, you can define granular logic to control how alerts reach yo
   - During business hours, route alerts to an escalation policy.
   - After hours, route critical alerts to paging, and non-critical alerts to chat.
 
+- Delay escalation outside of support hours:
+  - Define [support hours](#support-hours) on an escalation policy action to postpone notifications until the next active window.
+  - For example, a Page that arrives at 2:00 AM on Saturday creates a case immediately, but does not notify responders until 9:00 AM on Monday.
+
 - Use Dynamic Urgency to automatically detect urgency from the monitor alert:
   - `warn` status ➝ low urgency
   - `alert` status ➝ high urgency
@@ -55,11 +59,81 @@ Routing rules use [Datadog query syntax][3] and support multiple `if/else` condi
 | `priority`     | Monitor priority (1–5)                                                      | `priority:(1 OR 2)`                     |
 | `alert_status` | Monitor status (`error`, `warn`, `success`)                                 | `alert_status:(error OR warn)`          |
 
+## Support hours
+
+Support hours let you define time windows during which an escalation policy actively notifies responders. When a Page arrives outside of support hours, Datadog creates the Page immediately but **postpones** the escalation policy until the next active support hours window. After the postponement period ends, the escalation policy begins executing normally.
+
+### How support hours work
+
+1. An alert triggers a Page to an On-Call team.
+1. Routing rules are evaluated from top to bottom to find a matching rule.
+1. The matching rule's escalation policy action checks the current time against the configured support hours:
+   - **Inside support hours**: The escalation policy executes immediately and responders are notified.
+   - **Outside support hours**: The Page is created and the escalation policy is postponed. Datadog records a timeline entry on the Page indicating the postponement. When support hours resume, the escalation policy begins executing.
+
+### Support hours compared to time restrictions
+
+Routing rules support two types of time-based controls. They serve different purposes:
+
+| Feature | What it controls | Behavior outside the time window |
+|---------|-----------------|----------------------------------|
+| **Time restrictions** | When the routing rule **evaluates** | The rule is skipped and the next rule is tried. No Page is created by this rule. |
+| **Support hours** | When the escalation policy **notifies responders** | The Page is created immediately, but notifications are postponed until the next active window. |
+
+For example, if your team handles priority 2 alerts and wants to track all alerts but only page responders during business hours, use **support hours**. If your team should not handle certain alerts at all outside of business hours (and another rule or team should handle them instead), use **time restrictions**.
+
+<div class="alert alert-warning">You cannot configure both time restrictions and support hours on the same routing rule. Use one or the other.</div>
+
+### Configure support hours
+
+To add support hours to a routing rule's escalation policy action, configure a time zone and one or more time windows (restrictions).
+
+Each support hours configuration includes:
+- **Time zone**: An IANA time zone (for example, `America/New_York`, `Europe/Paris`, or `Asia/Tokyo`).
+- **Restrictions**: One or more time windows that define when the escalation policy is active. Each restriction specifies:
+  - A **start day** and **start time**
+  - An **end day** and **end time**
+
+Times use the `HH:MM:SS` format (for example, `09:00:00` for 9:00 AM).
+
+If multiple restriction windows are defined, the escalation policy is active if the current time matches **any** of the windows.
+
+#### Example: Business hours only (Monday through Friday, 9 AM to 5 PM)
+
+Set a single restriction window:
+- **Start day**: Monday, **Start time**: 09:00:00
+- **End day**: Friday, **End time**: 17:00:00
+- **Time zone**: `America/New_York`
+
+Pages that arrive outside this window (for example, at 2:00 AM on Saturday) are postponed until 9:00 AM on the following Monday.
+
+#### Example: Split shift (mornings and afternoons)
+
+Define two restriction windows to cover non-contiguous hours:
+
+**Window 1:**
+- **Start day**: Monday, **Start time**: 09:00:00
+- **End day**: Friday, **End time**: 12:00:00
+
+**Window 2:**
+- **Start day**: Monday, **Start time**: 14:00:00
+- **End day**: Friday, **End time**: 18:00:00
+
+Pages that arrive between 12:00 PM and 2:00 PM are postponed until the afternoon window opens.
+
 ## Best practices
 
 - Balance visibility with urgency:
   - Use paging and escalation policies for critical alerts that require immediate action.
-  - Use Slack or Teams for lower-severity issues that need awareness but don’t warrant an on-call response.
+  - Use Slack or Teams for lower-severity issues that need awareness but don't warrant an on-call response.
+
+- Use support hours to protect responders from off-hours notifications:
+  - For non-critical alerts, configure support hours to match your team's working hours. Pages are tracked immediately but responders are only notified during active windows.
+  - For critical alerts that require immediate attention regardless of time, do **not** set support hours on the escalation policy.
+
+- Choose between time restrictions and support hours based on your routing needs:
+  - Use **time restrictions** when a different routing rule or team should handle the alert outside of business hours.
+  - Use **support hours** when your team should own the alert at all times but only page responders during defined hours.
 
 ## Further reading