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UptimeRobot monitors website availability from 9 global locations, sending alerts via email, SMS, Slack, and webhooks when sites go down.

YandexBot is the main crawler for Yandex, Russia's largest search engine, indexing content for Russian-speaking users across multiple countries.

Generic crawler that may be used by various product teams for fetching publicly accessible content from sites. For example, it may be used for one-off crawls for internal research and development. https://developers.google.com/search/docs/crawling-indexing/overview-google-crawlers#googleother

New Relic monitors website and application performance, providing real user monitoring, synthetic monitoring, and APM for DevOps teams.

PetalBot is to access both PC and mobile websites and establish an index database which enables users to search the content of your site in Petal search engine and present content recommendations for the user in Huawei Assistant and AI Search services, both services are powered by Petal Search engine.

SemrushBotBacklinks discovers and analyzes backlinks for Semrush's backlink database and link building tools.

URL prefetching means that Cloudflare pre-populates the cache with content a visitor is likely to request next. This setting leads to a higher cache hit rate and thus a faster experience for the user. (https://developers.cloudflare.com/fundamentals/speed/prefetch-urls/)

AhrefsBot is one of the most active SEO crawlers, indexing the web to build Ahrefs' backlink database for SEO analysis, competitor research, and keyword tracking.

Pinterestbot is Pinterest’s web crawler. Pinterestbot crawls, or visits public websites to index their content, with the aim of driving traffic back to those websites. It also scrapes content to make sure Pin details, like price and title, are up to date, and to detect and remove broken website links behind Pins.

Datadog Synthetics gives you a new layer of visibility on the Datadog platform. By monitoring your applications and API endpoints via simulated user requests and browser rendering.

Google AdsBot checks landing page quality for Google Ads campaigns, evaluating load speed, content relevance, and ad policy compliance to determine Quality Scores.

meta-externalagent crawls web content for training AI models and improving Meta's products by indexing content directly across the internet.

Amazonbot is Amazon's web crawler used to improve our services, such as enabling Alexa to answer even more questions for customers. Amazonbot is a polite crawler that respects standard robots.txt rules and robots meta tags.

bingbot is Microsoft's standard web crawler that handles most of Bing's crawling needs each day, indexing web content for Bing search results using both desktop and mobile variants.

Google Image Proxy is a link preview crawler that fetches page metadata to generate rich previews when URLs are shared.

GPTBot is OpenAI's web crawler that collects training data for GPT models. Publishers can block it via robots.txt to opt out of AI training.

Chrome-Lighthouse is an automated, open-source tool that audits web pages for performance, accessibility, progressive web apps, SEO, and best practices. It runs a series of audits against a page and generates a comprehensive report on how well the page did.

Qualys Web Application Scanner is a cloud-based service that provides automated crawling and testing of custom web applications to identify vulnerabilities including cross-site scripting (XSS) and SQL injection.

The primary purpose of FacebookExternalHit is to crawl the content of an app or website that was shared on one of Meta’s family of apps, such as Facebook, Instagram, or Messenger. The link might have been shared by copying and pasting or by using the Facebook social plugin. This crawler gathers, caches, and displays information about the app or website such as its title, description, and thumbnail image.

Googlebot is Google's web crawler that discovers and indexes web content for Google Search, including both mobile and desktop variants that crawl websites to understand their content.