{"action":"opened","issue":{"url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers/issues/611","repository_url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers","labels_url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers/issues/611/labels{/name}","comments_url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers/issues/611/comments","events_url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers/issues/611/events","html_url":"https://github.com/UCATLAS/xAODAnaHelpers/issues/611","id":160407808,"number":611,"title":"Create systematics registry that is backwards-compatible","user":{"login":"kratsg","id":761483,"avatar_url":"https://avatars.githubusercontent.com/u/761483?v=3","gravatar_id":"","url":"https://api.github.com/users/kratsg","html_url":"https://github.com/kratsg","followers_url":"https://api.github.com/users/kratsg/followers","following_url":"https://api.github.com/users/kratsg/following{/other_user}","gists_url":"https://api.github.com/users/kratsg/gists{/gist_id}","starred_url":"https://api.github.com/users/kratsg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kratsg/subscriptions","organizations_url":"https://api.github.com/users/kratsg/orgs","repos_url":"https://api.github.com/users/kratsg/repos","events_url":"https://api.github.com/users/kratsg/events{/privacy}","received_events_url":"https://api.github.com/users/kratsg/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/UCATLAS/xAODAnaHelpers/labels/enhancement","name":"enhancement","color":"84b6eb"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-06-15T12:17:06Z","updated_at":"2016-06-15T12:17:06Z","closed_at":null,"body":"Currently, we thread systematics. In the cases where we have a unique set of systematics for one type of object (one for a jet collection, one for an electron collection, one for a muon collection) -- we can register the systematic vector names to a central registry and the algorithms can grab the name from this registry if systematics are enabled in the algorithm but there is no systematic vector name supplied.\r\n\r\nThis ensures backwards-compatibility -- but also simplifies the workflow for some non-negligible set of analyses using us."}}
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