You will find the following kind of alerts in the current sub-folders:
ipac: simulated alerts from Frank Masci copied from the official IPAC ZTF repo (last update: 11 dec 17)
uli: alerts from previous survey PTF provided by Uli Feindt
ztf_public_20180819_mod1000: every 1000th public alert from 20180819
Please check also: