flush gzip writer after every event
flush gzip writer after every event

[#91025870]

pivotal-devin-fallak/atc,savaki/atc,simonjjones/atc,savaki/atc,zachgersh/atc,zachgersh/atc,utako/atc,simonjjones/atc,zachgersh/atc,savaki/atc,simonjjones/atc,utako/atc,pivotal-devin-fallak/atc,pivotal-devin-fallak/atc,utako/atc,zachgersh/atc