Publishing Messages

This topic describes how to publish messages  directly using the Notifications service. You can manually enter the message content or allow a service or app to programmatically define the message content.

Each message is broadcast to all subscriptions  in the specified topic . Every message sent out as email contains a link to unsubscribe from the related topic.

Message delivery rate limits per endpoint: 60 messages per minute for HTTP-based protocols. (HTTP-based protocols use URL endpoints that begin with "http:" or "https:".) 10 messages per minute for Email protocol.


Avoid entering confidential information when assigning descriptions, tags, or friendly names to your cloud resources through the Oracle Cloud Infrastructure Console, API, or CLI.


  • IAM policies: To use Notifications, you must be given the required type of access in a policy  written by an administrator, whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you get a response that you don’t have permission or are unauthorized, check with your administrator. You may not have the required type of access in the current compartment . For more information on user authorizations, see Notifications Overview.
  • Before you can publish a message, you need a topic with at least one subscription. See Managing Topics and Subscriptions.

Creating Automation with Functions and Events

You can create automation by publishing messages to function subscriptions. For an example of a function subscription, see Scenario A: Automatically Resize VMs.

You can create also automation based on state changes of your topics and subscriptions (Notifications resources) by using event types, rules, and actions. For more information, see Overview of Events.

Using the Console

To publish a message

Using the API

For information about using the API and signing requests, see REST APIs and Security Credentials. For information about SDKs, see Software Development Kits and Command Line Interface.

Use these API operations to publish messages: