Assess the state of our logging

[grahamalama]

We realized in #644 that we weren't logging some valuable information at the correct log level. #644 was a "quick fix", but we should go through our app and examine all the logging we're doing to answer these questions:

• are we logging messages at the correct level?
• are we logging the right amount information?

[leplatrem]

Something I noticed while investigating #747 is that our logger.debug() messages don't show up in Log Explorer. Maybe we should log most of them at INFO level 🤷