#33 reduce old server- & healthcheck data

已合并

tunefish 于 1 年之前将 3 次代码提交从 hostbbq/feature/data-cleanup合并至 hostbbq/master

作者	SHA1 备注	提交日期
Christian Kahlau	cba74d7fd4 reduce health check data: remove after 3M	1 年之前
Christian Kahlau	d42eb21d85 reducing server data: implemented new all-in-one method	1 年之前
Christian Kahlau	e3e386dbea first draft: reduce server metrics data	1 年之前