What does anc_forms mean in base_settings

We are planning to support multiple sms codes for some of our SMS instances. As we are working on some of the anc codes, I saw that there is some setting on base settings here.

I couldn’t find corresponding document or usage of this key. Is it okay to ignore this setting or it’s used for some purpose ?

I found a reference to this in this issue: ANC analytics · Issue #586 · medic/cht-core · GitHub
This issue: Some settings are hard to understand · Issue #2122 · medic/cht-core · GitHub confirms that the specific config was used in an analytics module.
It seems like there was an analytics ANC module in the past, and it seems to have been removed in 3.0 (but I can’t find the specific commit).
Code from 2.18.x: cht-core/analytics-anc.js at 2.18.x · medic/cht-core · GitHub

I found the specific issue that removed the ANC Analytics feature: Remove the rest of lucene · Issue #1002 · medic/cht-core · GitHub