permit exact matches of relative paths for untargeted line trace points

lib/datadog/di/instrumenter.rb

@@ -266,7 +266,11 @@ def hook_line(probe, &block)
             # If trace point is not targeted, we must verify that the invocation
             # is the file & line that we want, because untargeted trace points
             # are invoked for *each* line of Ruby executed.
-            if iseq || tp.lineno == probe.line_no && probe.file_matches?(tp.path)
+            # TODO find out exactly when the path in trace point is relative.
+            # Looks like this is the case when line trace point is not targeted?
+            if iseq || tp.lineno == probe.line_no && (
+              probe.file == tp.path || probe.file_matches?(tp.path)
+            )
               if rate_limiter.nil? || rate_limiter.allow?
                 # & is to stop steep complaints, block is always present here.
                 block&.call(probe: probe, trace_point: tp, caller_locations: caller_locations)