OK. I got a bit too far ahead of myself 🙂 The TZ setting is only applied if there is no timezone specified within the timestamp parsed from the event so in your case this setting - even though it is set - will not apply because you have your "IST" in your time string. Time is generally being parsed on the first "heavy" (based on a full installation, not the universal forwarder binary) component in event's path. So if you're sending your events straight from UF to indexers, the events are parsed on indexers (including timestamp recognition and parsing). If you're sending them from UF to HF(s) which are sending to indexers, parsing is done on HFs. And on those parsing components (in the first case - indexers, in second - on HFs) you need the TZ_ALIAS config. So if you deploy your config only to UFs, it won't work since UFs don't parse events. They just read/receive them (depending on the type of input) and forward them to indexers/HFs.
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