Add caller_location_filter for custom location key computation

[jdyoung73]

Problem

Some gems produce different stack frames on the first (cold) vs subsequent (warm) calls to a method. For example, sorbet-runtime uses call_validation.rb on the cold path and call_validation_2_7.rb on the warm path, plus an extra _methods.rb frame during cold method compilation. Other observability or instrumentation gems may add extra frames on the first call to an instrumented method.

Since Prosopite groups queries by hashing the full caller_locations into a location_key, these differing frames cause identical N+1 queries to be split into separate groups. With exactly 2 queries through such a method, each gets a unique location key (count=1 each) and Prosopite sees no N+1. With 3+ queries the warm path accumulates count>=2, making detection intermittent rather than reliable.

Solution

Add an ignore_location_paths configuration option — an array of strings or regexes, consistent with the existing ignore_queries and allow_stack_paths APIs. Matching frames are excluded from the location key computation. The full unfiltered caller is still stored for notification display and allow_stack_paths matching.

Prosopite.ignore_location_paths = ['sorbet-runtime']

This is a minimal, non-breaking change:

• 1 new attr_accessor
• 1 new method (ignore_location_path?) matching the pattern of ignore_query?
• 1 line added in subscribe
• Defaults to [] (no filtering), preserving existing behavior
• All existing tests pass unchanged

Test plan

• Added test_ignore_location_paths — verifies N+1 detection works with string matching
• Added test_ignore_location_paths_with_regex — verifies regex matching works
• Added test_ignore_location_paths_nil_by_default — verifies default behavior is unchanged
• All 59 tests pass

[jdyoung73]

Hi @charkost. When you get a chance, would you mind taking a look at this PR? We've been running into intermittent N+1 detection misses due to gems like sorbet-runtime producing different stack frames on cold vs warm calls, and this small addition would help a lot.

Happy to make any changes based on your feedback.