Apply suggestions from code review

Co-authored-by: Florian Lehner <florianl@users.noreply.github.com>

Author: dalehamel

interpreter/ruby/ruby.go

@@ -69,6 +69,7 @@ const (
 	rarrayEmbed = RUBY_FL_USER1
 
 	// PATHOBJ_REALPATH
+	// https://github.com/ruby/ruby/blob/3185786874315ab4f1cfcc73c3d1b14613452905/vm_core.h#L343
 	pathObjRealPathIdx = 1
 
 	// ISEQ_TYPE_METHOD
@@ -94,7 +95,7 @@ var (
 	// regex to extract a version from a string
 	rubyVersionRegex = regexp.MustCompile(`^(\d)\.(\d)\.(\d)$`)
 
-	unknownCfunc   = libpf.Intern("<unknown ruby cfunc>")
+	unknownCfunc   = libpf.Intern("<unknown cfunc>")
 	cfuncDummyFile = libpf.Intern("<cfunc>")
 	// compiler check to make sure the needed interfaces are satisfied
 	_ interpreter.Data     = &rubyData{}

metrics/metrics.json

@@ -1765,14 +1765,16 @@
     "id": 243
   },
   {
-    "description": "Number of failures to read the instruction sequence encoded size (deprecated)",
+    "description": "Number of failures to read the instruction sequence encoded size",
+    "obsolete": true,
     "type": "counter",
     "name": "UnwindRubyErrReadIseqEncoded",
     "field": "bpf.ruby.errors.read_iseq_encoded",
     "id": 244
   },
   {
-    "description": "Number of failures to read the instruction sequence size (deprecated)",
+    "description": "Number of failures to read the instruction sequence size",
+    "obsolete": true,
     "type": "counter",
     "name": "UnwindRubyErrReadIseqSize",
     "field": "bpf.ruby.errors.read_iseq_size",