I'm not getting any DarkSky data.
Searching the splunkd.log, the closest thing I see to an error is
no stanzas found for scheme
07-29-2019 18:55:30.056 -0600 INFO ExecProcessor - New scheduled exec process: python /opt/splunk/etc/apps/darksky_ta/bin/darksky.py
07-29-2019 18:55:30.056 -0600 INFO ModularInputs - No stanzas found for scheme "darksky" in inputs.conf at script (re)start.
07-29-2019 18:55:29.490 -0600 INFO ModularInputs - Introspection setup completed for scheme "darksky".
07-29-2019 18:55:29.386 -0600 INFO SpecFiles - Found external scheme definition for stanza="darksky://" from spec file="/opt/splunk/etc/apps/darksky_ta/README/inputs.conf.spec" with parameters="apikey, longitude, latitude"
Running on Ubuntu.