sending-notifications

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npx skills add https://github.com/posthog/posthog-foss --skill sending-notifications

Sending real-time notifications

When to use this

You're adding notification support to a PostHog feature — for example, notifying a user when they're mentioned in a comment, when an alert fires, or when an approval is requested.

The facade API

All notification creation goes through a single function. Import from the facade, not from internal modules:

from products.notifications.backend.facade.api import (
    create_notification,
    NotificationData,
    NotificationType,
    Priority,
    TargetType,
)

Build a NotificationData and call create_notification:

event = create_notification(
    NotificationData(
        team_id=team.id,
        notification_type=NotificationType.ALERT_FIRING,
        priority=Priority.CRITICAL,
        title="Event ingestion latency > 30s",
        body="Events are queuing up. Ingestion pipeline is degraded.",
        target_type=TargetType.USER,
        target_id=str(user.id),
        resource_type="dashboard",
        resource_id="42",
        source_url="/dashboard/42",
    )
)

Returns a NotificationEvent on success, or None if the feature flag is disabled, no recipients were resolved, or the team doesn't exist. Safe to call in any context.

NotificationData fields

Required:

Field	Type	Description
`team_id`	`int`	Team context — used to look up the organization and check the feature flag
`notification_type`	`NotificationType`	Determines the icon in the UI
`title`	`str`	Notification headline (~100 chars recommended)
`body`	`str`	Longer description shown on expand. Can be empty string
`target_type`	`TargetType`	Who receives this: `user`, `team`, `organization`, or `role`
`target_id`	`str`	ID of the target (user ID, team ID, org UUID, or role UUID as string)

Optional:

Field	Type	Default	Description
`resource_type`	`NotificationResourceType \| None`	`None`	Access-controlled types (e.g. `"dashboard"`) auto-filter recipients without viewer access
`resource_id`	`str`	`""`	ID of the resource for linking
`source_url`	`str`	`""`	Relative URL path (e.g. `/dashboard/42`), shown as link icon in UI
`priority`	`Priority`	`NORMAL`	`normal` = popover only; `critical` = popover + persistent toast
`archivable`	`bool`	`False`	Opt in to a per-recipient "archive" (dismiss) action that moves the notification to the recipient's Archived tab. When `False`, recipients can only mark it read/unread (the default pattern)
`resolver`	`RecipientsResolver \| None`	`None`	Custom recipient resolver. Default handles user/team/org/role targeting

Choosing parameters

Notification type

Type	When to use
`comment_mention`	User was @mentioned in a comment or discussion
`alert_firing`	A monitoring alert threshold was breached
`approval_requested`	A change requires the user's approval
`approval_resolved`	An approval the user requested has been resolved
`pipeline_failure`	A data pipeline or batch export failed
`issue_assigned`	An error tracking issue was assigned to the user

Priority

Be very careful with critical. It triggers a persistent toast popup that overlays the user's screen and must be manually dismissed. This is intentionally intrusive — reserve it for genuine emergencies like outages, security alerts, or SLA breaches. Overusing critical will train users to ignore notifications entirely. When in doubt, use normal.

Target type

Target	`target_id` value	Recipients
`user`	User ID	Just that user
`team`	Team ID	All members of the team's organization
`organization`	Organization ID	All organization members
`role`	Role ID	All users with that RBAC role

Resource type and access control

When resource_type matches an access-controlled resource (dashboard, feature_flag, experiment, etc.), recipients without viewer access are automatically excluded. For notification-only types (pipeline, approval, comment), no AC filtering is applied.

Delivery pipeline

Django (create_notification)
  → Postgres (NotificationEvent row)
  → Kafka (notification_events topic, on transaction commit)
  → Go livestream service (Kafka consumer)
  → Redis SPUBLISH (sharded pub/sub, keyed by org ID)
  → SSE (/notifications endpoint)
  → Browser (popover + optional toast)

Kafka publish happens on transaction.on_commit — won't fire if the transaction rolls back.

Adding a new notification type

Add enum value in products/notifications/backend/facade/enums.py
Add icon mapping in frontend/src/lib/components/NotificationsMenu/notificationToasts.tsx (NOTIFICATION_TYPE_ICONS) — the single icon source, read by getNotificationIcon, which only NotificationRow calls; the side panel gets the icon by rendering that row
Add a label + description entry in frontend/src/lib/components/NotificationsMenu/NotificationRow.tsx (REALTIME_NOTIFICATION_TYPE_META) — drives the per-type notification preferences UI
Run python manage.py makemigrations notifications

Testing

Mock the feature flag in tests:

from unittest.mock import patch

with patch("posthoganalytics.feature_enabled", side_effect=lambda flag, *a, **kw: flag == "real-time-notifications"):
    event = create_notification(data)