Whew, glad to hear this!
I have migrated all reports built in Google Looker from using earlier connector versions to 1.4.0. All reports working as expected. I did have a small glitch in a handful of reports when a metric in a column chart switched from the metric I was using to something else. I don’t have screenshots, but the switched metric was either a calculated field from Piwik Pro or a calculated field from Looker.
Yeah, it’s possible. There was quite a lot of fixes to the dimension/metric schema since v1.0.7.
Just checking since I can’t find documentation on this: is there some threshold that would cause the Looker Studio connector (or Web API since I’m assuming the connector is using that) to query sampled data? The data between the web UI (at 100% of data) and Looker have matched exactly for now, but it would be nice to make sure to know as my hit counts increase.