Add get_trace_propagation_meta helper

CHANGELOG.md

@@ -17,6 +17,7 @@
       config.enabled_patches += [:graphql]
     end
     ```
+- Add `Sentry.get_trace_propagation_meta` helper for injecting meta tags into views ([#2314](https://github.com/getsentry/sentry-ruby/pull/2314))
 
 ### Bug Fixes
 

sentry-ruby/lib/sentry-ruby.rb

@@ -551,6 +551,15 @@ def get_trace_propagation_headers
       get_current_hub.get_trace_propagation_headers
     end
 
+    # Returns the a Hash containing sentry-trace and baggage.
+    # Can be either from the currently active span or the propagation context.
+    #
+    # @return [String]
+    def get_trace_propagation_meta
+      return '' unless initialized?
+      get_current_hub.get_trace_propagation_meta
+    end
+
     # Continue an incoming trace from a rack env like hash.
     #
     # @param env [Hash]

sentry-ruby/lib/sentry/hub.rb

@@ -284,6 +284,12 @@ def get_trace_propagation_headers
       headers
     end
 
+    def get_trace_propagation_meta
+      get_trace_propagation_headers.map do |k, v|
+        "<meta name=\"#{k}\" content=\"#{v}\">"
+      end.join("\n")
+    end
+
     def continue_trace(env, **options)
       configure_scope { |s| s.generate_propagation_context(env) }
 

sentry-ruby/spec/sentry_spec.rb

@@ -782,6 +782,17 @@
     end
   end
 
+  describe ".get_trace_propagation_meta" do
+    it "returns meta tags for sentry-trace and baggage" do
+      meta = <<~META
+      <meta name="sentry-trace" content="#{described_class.get_traceparent}">
+      <meta name="baggage" content="#{described_class.get_baggage}">
+      META
+
+      expect(described_class.get_trace_propagation_meta).to eq(meta.chomp)
+    end
+  end
+
   describe ".continue_trace" do
     context "without incoming sentry trace" do
       let(:env) { { "HTTP_FOO" => "bar" } }