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A Chrome browser update , which has been rolling out since February , now issues a warning when you 've landed on an page with the scam .
 patch vulnerability: has been rolling out
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 patch vulnerability: has been rolling out