Yes, some customers classify their incidents in playbook. Usually in the case you mentioned, that you don't have enough context in the incident creation time, but only during the playbook execution time.
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There is no latest tag, every docker has special version tag https://hub.docker.com/r/demisto/fetch-data/tags?page=1&ordering=last_updated To pull docker image manually you should run docker pull demisto/fetch-data:1.0.0.14842
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I think the problem you are having is related to the new limitation Docker introduced https://www.docker.com/increase-rate-limits#:~:text=Anonymous%20and%20Free%20Docker%20Hub,%3A%20toomanyrequests%3A%20Too%20Many%20Requests.&text=You%20have%20reached%20your%20pull%20rate%20limit. They limited the pull rate to 100 pulls per 6 hours, meaning if you will try to install your pack now, you should not get that warning.
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We have it on our roadmap to release new integration in PowerShell that will allow to block senders globally. It should be release by the end of this quarter.
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