Hostnames are missing for some job entries in elasticsearch. Example submit directories for workflows where this happened can be found in the attached report pdf.
For additional data, use the following kibana query: https://display.pegasus.isi.edu/kibana/app/discover#/view/3042e8a0-df6e-11eb-91b5-07e16c5a11e8?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-6M,to:now))&_a=(columns:!(hostname,submit_hostname,pegasus_version,user),filters:!(('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'7ecd02d0-125f-11eb-9e40-e14c185fd78b',key:submit_hostname,negate:!f,params:!(login04.osgconnect.net,login05.osgconnect.net,xenon,login-el7.xenon.ci-connect.net),type:phrases,value:'login04.osgconnect.net,%20login05.osgconnect.net,%20xenon,%20login-el7.xenon.ci-connect.net'),query:(bool:(minimum_should_match:1,should:!((match_phrase:(submit_hostname:login04.osgconnect.net)),(match_phrase:(submit_hostname:login05.osgconnect.net)),(match_phrase:(submit_hostname:xenon)),(match_phrase:(submit_hostname:login-el7.xenon.ci-connect.net)))))),('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'7ecd02d0-125f-11eb-9e40-e14c185fd78b',key:jobtype,negate:!f,params:(query:compute),type:phrase),query:(match_phrase:(jobtype:compute)))),index:'7ecd02d0-125f-11eb-9e40-e14c185fd78b',interval:auto,query:(language:kuery,query:int_error_count%3E%3D1),sort:!(!('@timestamp',desc)))