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To send a pubsub message when a cloud function with HTTP trigger is activated by someone, you can use the Cloud Pub/Sub client library and the pubsub topic webhook.

Here are the steps:

1. Create a Cloud Pub/Sub topic and add a subscriber to it. The subscriber can be a Cloud Function that will receive the message.

2. In your Cloud Function code, import the Pub/Sub client library and configure it to use the appropriate credentials.

3. In your function code, use the Pub/Sub client library to publish a message to the topic.

4. In your Pub/Sub subscriber function code, read the message and perform any necessary actions.

Here's an example code snippet that sends a Pub/Sub message when an HTTP Cloud Function is triggered:

import base64
from google.cloud import pubsub_v1

publisher = pubsub_v1.PublisherClient()
topic_name = 'projects/{project_id}/topics/{topic_name}'.format(
    project_id='<your-project-id>',
    topic_name='<your-topic-name>',
)

def my_function(request):
    # Do something
    # ...

    # Publish a message to Pub/Sub
    message = 'Hello, world!'
    message_bytes = message.encode('utf-8')
    message = base64.b64encode(message_bytes).decode('utf-8')
    publisher.publish(topic_name, data=message)

    return 'Message published to Pub/Sub.'

When this function is triggered by an HTTP request, it will publish a 'Hello, world!' message to the given Pub/Sub topic. The subscriber function can then read this message and perform any necessary actions.