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magento-2-google-customer-reviews
Apply Free Google Customer Reviews for Magento 2 to drive more traffic, increase conversion and boost click-through rate.
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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.
I think you should not “reinvent the wheel” and use an existing module such as https://github.com/aitoc/magento-2-google-customer-reviews. You can’t just add a piece of code to your Magento shop like in a Symfony controllers like the examples in the project link you provided.
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.