Google Cloud CDN

Configure crawler log ingestion via GCP Pub/Sub and Log Router

This integration ingests Google Cloud CDN (HTTP Load Balancer) request logs into Promptwatch using a Pub/Sub topic, push subscription, and a Log Router sink. Make sure to only route logs from your project’s website.

Prerequisites

• You are using Google Cloud CDN / HTTP(S) Load Balancer
• You have access to the GCP project and permissions to create Pub/Sub resources and Log Router sinks

Step 1: Service Account (Verification)

If you already know the service account email you’ll use to authorize this setup, note it down. You’ll need it when creating the push subscription in Step 3.

In Promptwatch, navigate to Crawler Logs → Settings, click the Google Cloud button, and enter the service account email you select when creating the push subscription. This lets Promptwatch validate incoming requests.

The service account email is used for verification. During the creation of the Pub/Sub push subscription, you’ll select a service account for authentication.

Step 2: Create Pub/Sub Topic

In Google Cloud Console, create a Pub/Sub topic for your Cloud CDN logs.

• Navigate to Pub/Sub → Topics
• Click Create topic, name it, and create it

Step 3: Create Push Subscription

Create a push subscription for the topic you created.

• Navigate to Pub/Sub → Subscriptions
• Click Create subscription
• Give your subscription an ID
• Select the topic you created in Step 2
• Set Delivery type to Push
• Set the endpoint URL to:

https://logs.promptwatch.com/event/gcp

• Click Enable authentication and select a service account
• Enable payload unwrapping

Use the same service account email here as the one you’ll save in Promptwatch (Step 1).

You can also adjust retention, retry policy, and throughput settings in this setup.

Step 4: Add Message Transform

Add a Pub/Sub message transform to reduce the payload before sending to Promptwatch.

• In your subscription, click Add a transform
• Set the function name to log_reduce
• Paste this function and click Validate:

/* This is used to filter the unused fields before sending to the analytics service.
 *
 * @param {Object} message - The message to reduce.
 * @param {Object} metadata - The metadata of the message.
 * @returns {Object} The reduced message.
 */

function log_reduce(message, metadata) {
  // parse the message
  const data = JSON.parse(message.data);

  // remove unused fields
  delete data['resource'];
  delete data['severity'];
  delete data['spanId'];
  delete data['trace'];
  delete data['insertId'];
  delete data['jsonPayload'];
  delete data['logName'];
  delete data['receiveTimestamp'];

  message.data = JSON.stringify(data);

  return message;
}

This transform drops unneeded fields before sending to Promptwatch. It reduces export volume, improves performance, and enhances data security.

Optional: Filter on known AI Crawler user agents

Promptwatch identifies AI crawlers automatically and only stores AI crawler visits, all other traffic is discarded. You can safely send all your server logs without worrying about non-crawler data being retained.

If you prefer to only forward AI crawler traffic, you can use the user agents listed below to pre-filter on your side. Keep in mind that you’ll need to maintain this list yourself as new crawlers emerge.

OpenAI (3)

Name	User Agent	Full User Agent	Description
GPT Bot	GPTBot	Mozilla/5.0 (compatible; GPTBot/1.0; +https://openai.com/gptbot)	Used to crawl content for training OpenAI’s generative AI foundation models.
SearchBot	OAI-SearchBot	Mozilla/5.0 (compatible; OAI-SearchBot/1.0; +https://openai.com/searchbot)	Used by ChatGPT search to surface websites in search results.
ChatGPT Citations	ChatGPT-User	Mozilla/5.0 (compatible; ChatGPT-User/1.0; +https://openai.com/bot)	Used for user actions in ChatGPT when visiting web pages.

Anthropic (5)

Name	User Agent	Full User Agent	Description
Claude Bot	ClaudeBot	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ClaudeBot/1.0; [e-mail])	Used to crawl content for training Anthropic’s generative AI models.
Claude Citations	Claude-User	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Claude-User/1.0; [e-mail])	When individuals ask questions to Claude or use Claude Code, it may access websites using a Claude-User agent.
Claude Search Bot	Claude-SearchBot	Mozilla/5.0 (compatible; claude-search-bot/1.0; +http://www.anthropic.com/bot.html)	Navigates the web to improve search result quality for users.
Claude Web	claude-web	Mozilla/5.0 (compatible; claude-web/1.0; +http://www.anthropic.com/bot.html)	Targeted crawler for recent web content, feeding the Claude browser agent with updated site data.
Anthropic AI	anthropic-ai	Mozilla/5.0 (compatible; anthropic-ai/1.0; +http://www.anthropic.com/bot.html)	Primary Anthropic crawler that collects broad web data for Claude model development.

Google (3)

Name	User Agent	Full User Agent	Description
Gemini	Google-Extended	Mozilla/5.0 (compatible; Google-Extended/1.0; +http://www.google.com/bot.html)	Controls whether content can be used for training Gemini AI models.
Google Mobile Agent	Google-Agent	Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/W.X.Y.Z Mobile Safari/537.36 (compatible; Google-Agent; +https://developers.google.com/crawling/docs/crawlers-fetchers/google-agent)	Used by Google AI agents to autonomously browse the web and complete tasks on behalf of users (mobile).
Google Desktop Agent	Google-Agent	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Google-Agent; +https://developers.google.com/crawling/docs/crawlers-fetchers/google-agent) Chrome/W.X.Y.Z Safari/537.36	Used by Google AI agents to autonomously browse the web and complete tasks on behalf of users (desktop).

Perplexity (2)

Name	User Agent	Full User Agent	Description
Perplexity Bot	PerplexityBot	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot)	Used to surface and link websites in Perplexity search results.
Perplexity Citations	Perplexity-User	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)	Used for user actions in Perplexity when visiting web pages to answer questions.

Cohere (1)

Name	User Agent	Full User Agent	Description
Cohere AI	cohere-ai	Mozilla/5.0 (compatible; cohere-ai/1.0; +http://www.cohere.ai/bot.html)	Collects textual data for Cohere’s language models, helping refine large-scale text generation.

Mistral (1)

Name	User Agent	Full User Agent	Description
Mistral AI Citations	MistralAI-User	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; MistralAI-User/1.0; +https://docs.mistral.ai/robots)	Used for user actions in LeChat when visiting web pages to answer questions.

DeepSeek (1)

Name	User Agent	Full User Agent	Description
DeepSeek	DeepSeekBot	Mozilla/5.0 (compatible; DeepSeekBot/1.0; +http://www.deepseek.com/bot.html)	Used to crawl content for training DeepSeek’s generative AI models.

xAI / Grok (3)

Name	User Agent	Full User Agent	Description
Grok Bot	GrokBot	GrokBot/1.0 (+https://x.ai)	Used for training Grok AI.
Grok Search	xAI-Grok	xAI-Grok/1.0 (+https://grok.com)	Used for Grok’s search capabilities.
Grok Deep Search	Grok-DeepSearch	Grok-DeepSearch/1.0 (+https://x.ai)	Used for Grok’s advanced search capabilities.

Step 5: Create Log Router Sink

Create a Log Router sink to export the HTTP Load Balancer logs into your Pub/Sub topic.

• Search for Log Router (or go to Logging → Log Router)
• Click Create sink
• Give your sink a name
• For destination, choose Cloud Pub/Sub topic and select the topic from Step 2
• Add a filter similar to the following:

resource.type="http_load_balancer"
resource.labels.forwarding_rule_name="MY-FORWARDING-RULE-NAME"
resource.labels.url_map_name="MY-URL-MAP-NAME"

Replace MY-FORWARDING-RULE-NAME and MY-URL-MAP-NAME with your real values. Use “Preview logs” in Log Router to confirm what will and won’t be exported.

If you have multiple load balancers / URL maps, expand the filter like this:

resource.type="http_load_balancer"
AND (
  (resource.labels.forwarding_rule_name="MY-FORWARDING-RULE-NAME"
   AND resource.labels.url_map_name="MY-URL-MAP-NAME")
  OR
  (resource.labels.forwarding_rule_name="MY-FORWARDING-RULE-NAME-2"
   AND resource.labels.url_map_name="MY-URL-MAP-NAME-2")
)

If you are registering multiple domains, create a separate service account per domain and save the correct service account email in Step 1 for each project.

Step 6: Save Service Account in Promptwatch

In Promptwatch, navigate to Crawler Logs → Settings, click the Google Cloud button, and enter the service account email you selected when creating the push subscription in Step 3.

Once your first crawler traffic hits your site, logs should begin appearing in Promptwatch.