What is CloudflareCustomerSLOProber?

CloudflareCustomerSLOProber is a bot in the monitoring and analytics bots category, operated by Cloudflare.

Bot name
CloudflareCustomerSLOProber
Operator
Cloudflare
Type
Bot
Respects robots.txt
Not confirmed
robots.txt user agent
CustomerSLO
Signs requests (Web Bot Auth)
Yes

About CloudflareCustomerSLOProber

A service to verify the identity of Cloudflare-internal Customer SLO probes

Monitoring bots check uptime, performance and page changes on behalf of a site owner or a third party. Allow the services you run yourself and exclude them from analytics so they do not inflate page views.

CloudflareCustomerSLOProber user agent

CloudflareCustomerSLOProber identifies itself with this user agent string:

  • Cloudflare/1.0 CustomerSLO Prober

Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.

How to block CloudflareCustomerSLOProber in robots.txt

We have not confirmed whether CloudflareCustomerSLOProber follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.

Block CloudflareCustomerSLOProber from the whole site

User-agent: CustomerSLO
Disallow: /

Block CloudflareCustomerSLOProber from some folders

User-agent: CustomerSLO
Disallow: /private/
Disallow: /search

Allow CloudflareCustomerSLOProber only on some folders

User-agent: CustomerSLO
Allow: /blog/
Disallow: /

Allow CloudflareCustomerSLOProber and block other crawlers

User-agent: CustomerSLO
Allow: /

User-agent: *
Disallow: /

Things to know

  • Each host needs its own file. Rules on www.example.com do not apply to shop.example.com.
  • A crawler obeys only the most specific group that names it. Once you add a User-agent: CustomerSLO group, CloudflareCustomerSLOProber ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take CustomerSLO from CloudflareCustomerSLOProber's user agent; check Cloudflare's own documentation if it publishes a different robots.txt name.
  • Crawlers cache robots.txt, so changes can take up to a day to apply. Disallow stops crawling but does not remove pages already collected or indexed.

Limits of robots.txt

  1. CloudflareCustomerSLOProber may not follow the rule. robots.txt is a request that nothing enforces, and we have not confirmed that CloudflareCustomerSLOProber follows it. Check your logs after adding a rule.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send CloudflareCustomerSLOProber's user agent, and a scraper using it is not bound by Cloudflare's robots.txt policy. Only checking the source network tells a real CloudflareCustomerSLOProber from a fake one.

Treat robots.txt as a statement of your policy, and enforce it where requests arrive.

Who should care about CloudflareCustomerSLOProber

Publishers

Allow CloudflareCustomerSLOProber if it is a service you use, and keep its visits out of page views and ad requests either way.

Transfon Security for publishers

Media buyers and advertisers

CloudflareCustomerSLOProber is not a person. Exclude it from campaign and conversion data so reports reflect real visitors.

Transfon Security for advertisers

E-commerce

Allow CloudflareCustomerSLOProber only if it works for your store, and keep it away from cart and checkout.

Transfon Security for e-commerce

SaaS and APIs

If CloudflareCustomerSLOProber is a service you use, allow it on the endpoints it needs and block it elsewhere.

Transfon Security for SaaS and APIs

Block CloudflareCustomerSLOProber with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows CloudflareCustomerSLOProber by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.

Transfon Security

Control CloudflareCustomerSLOProber on your site

  • See every CloudflareCustomerSLOProber visit and the pages it reads
  • Spot bots that fake trusted crawler names
  • Block, allow or rate limit CloudflareCustomerSLOProber with one rule
  • Works with or without robots.txt support

Frequently asked questions

What is CloudflareCustomerSLOProber?

CloudflareCustomerSLOProber is a bot in the monitoring and analytics bots category, operated by Cloudflare. A service to verify the identity of Cloudflare-internal Customer SLO probes

Does CloudflareCustomerSLOProber respect robots.txt?

We have not confirmed whether CloudflareCustomerSLOProber follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.

How do I block CloudflareCustomerSLOProber?

Add "User-agent: CustomerSLO" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "CustomerSLO Prober" at your WAF. In Transfon Security that is one User Agent block rule.

Is robots.txt enough to block CloudflareCustomerSLOProber?

No. robots.txt is voluntary, so CloudflareCustomerSLOProber may not follow it, and anyone can send CloudflareCustomerSLOProber's user agent, so a fake CloudflareCustomerSLOProber ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.

Should I block CloudflareCustomerSLOProber?

Monitoring bots check uptime, performance and page changes on behalf of a site owner or a third party. Allow the services you run yourself and exclude them from analytics so they do not inflate page views.

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