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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The most popular ft-plugin is vim-lua-ftplugin, although maybe it does too much. If you only need completion for the standard library and reserved keywords, I think it wouldn't be too difficult to simply use its data (https://github.com/xolox/vim-lua-ftplugin/blob/bcbf914046684f19955f24664c1659b330fcb241/autoload/xolox/lua_data.vim) in your own custom omnifunc (:h complete-functions).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.