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With the io.picolabs.logging ruleset installed in the pico, this tab will let you see the latest "episodes" (either events or queries) the pico has processed. Click on the checkbox to see detailed logging. To see more episodes, change the number in the box and click on the Logging tab again.
See also the Logging page.
Testing tab
The Testing tab displays a list of rulesets which are installed in the pico.
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