Bucket Notifications - doc

Signed-off-by: Amit Prinz Setter <[email protected]>

docs/bucket-notifications.md

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+# Bucket Notifications
+
+## Bucket Notification Configuration
+
+Bucket's notifications can be configured with the s3api operation [put-bucket-notification-configuration](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3api/put-bucket-notification-configuration.html).
+Specify notifications under the "TopicConfigurations" field, which is an array of jsons, one for each notification.
+A notification json has these fields:
+- Id: Mandatory. A unique string identifying the notification configuration.
+- Events: Optional. An array of [events](https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-how-to-event-types-and-destinations.html) for which the notification is relevant.
+          If not specified, the notification is relevant for all events.
+- TopicArn: The path to the connection file
+
+Example for a bucket's notification configuration, in a file:
+{
+    "TopicConfigurations": [
+        {
+	    "Id": "created_from_s3op",
+            "TopicArn": "/opt/noobaa/connect.kv",
+            "Events": [
+                "s3:ObjectCreated:*"
+            ]
+        }
+    ]
+}
+
+
+## Connection file
+A connection file contains some fields that specify the target notification server.
+The path to a connection file is specified in TopicArn field of the [notification configuration](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3api/put-bucket-notification-configuration.html)
+In a containerized environment, the operator will mount the secrets as file in the core pod (see operator doc for more info).
+In a non-containerized system, you must create the relevant file manually.
+
+### Common connection fields
+- name: A string identifying the connection (mandatory).
+- notification_protocol: One of: http, https, kafka (mandatory).
+
+### Http(s) connection fields
+- agent_request_object: Value is a JSON that is passed to to nodejs' http(s) agent (mandatory).
+Any field supported by nodejs' http(s) agent can be used, specifically 'host' and 'port'.
+A full list of options is [here](https://nodejs.org/docs/latest-v22.x/api/http.html#new-agentoptions).
+- request_options_object: Value is a JSON that is passed to nodejs' http(s) request (optional).
+Any field supported by nodejs' http(s) request option can be used, specifically 'auth' can be
+used for http simple auth. Value for 'auth' is of the syntax: <name>:<passowrd>.
+A full list of options is [here](https://nodejs.org/docs/latest-v22.x/api/http.html#httprequesturl-options-callback).
+
+### Kafka connection fields
+- metadata.broker.list: A CSV list of Kafka brokers (mandatory).
+- topic: A topic for the Kafka message (mandatory).