feat: Add compatible? method to instrumentation

instrumentation/elasticsearch/lib/opentelemetry/instrumentation/elasticsearch/instrumentation.rb

@@ -9,6 +9,7 @@ module Instrumentation
     module Elasticsearch
       # The Instrumentation class contains logic to detect and install the Elasticsearch instrumentation
       class Instrumentation < OpenTelemetry::Instrumentation::Base
+        MINIMUM_VERSION = Gem::Version.new('8.0.0')
 
         install do |_config|
           require_dependencies
@@ -19,6 +20,13 @@ class Instrumentation < OpenTelemetry::Instrumentation::Base
           !defined?(::Elastic::Transport::Client).nil?
         end
 
+        compatible do
+          # Versions < 8.0 of the elasticsearch client don't have the
+          # Elastic::Transport namespace so we have to check that it's
+          # present first.
+          present? && gem_version >= MINIMUM_VERSION
+        end
+
         def patch
           ::Elastic::Transport::Client.prepend(Patches::Client)
         end
@@ -29,6 +37,10 @@ def patch
 
         private
 
+        def gem_version
+          Gem::Version.new(::Elastic::Transport::VERSION)
+        end
+
         def require_dependencies
           require_relative 'patches/client'
           require_relative 'patches/deep_dup'

instrumentation/elasticsearch/test/instrumentation/elasticsearch/instrumentation_test.rb

@@ -31,6 +31,17 @@
     end
   end
 
+  describe 'compatible' do
+    it 'when older gem version installed' do
+      stub_const('::Elastic::Transport::VERSION', '7.17.7')
+      _(instrumentation.compatible?).must_equal false
+    end
+
+    it 'when future gem version installed' do
+      _(instrumentation.compatible?).must_equal true
+    end
+  end
+
   describe '#install' do
     it 'accepts argument' do
       _(instrumentation.install({})).must_equal(true)