Add logging for endpoint discovery issues

[sjberman]

Problem: A couple of issues have arisen relating to endpoint discovery, and we don't have much visibility into them.

Solution: Add some logs (both error and debug level) to help diagnose when endpoints are not found or have issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.05%. Comparing base (a847da1) to head (7cc19b5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3667   +/-   ##
=======================================
  Coverage   87.05%   87.05%           
=======================================
  Files         127      127           
  Lines       15580    15598   +18     
  Branches       62       62           
=======================================
+ Hits        13563    13579   +16     
- Misses       1858     1860    +2     
  Partials      159      159           

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