diff --git a/lib/datadog/ci/ext/telemetry.rb b/lib/datadog/ci/ext/telemetry.rb
index a26d8cd7..41c24051 100644
--- a/lib/datadog/ci/ext/telemetry.rb
+++ b/lib/datadog/ci/ext/telemetry.rb
@@ -86,7 +86,7 @@ module EventType
         end
 
         module Library
-          BUILTIN = "builtin"
+          CUSTOM = "custom"
         end
 
         module Endpoint
diff --git a/lib/datadog/ci/test_optimisation/telemetry.rb b/lib/datadog/ci/test_optimisation/telemetry.rb
new file mode 100644
index 00000000..d2be12bf
--- /dev/null
+++ b/lib/datadog/ci/test_optimisation/telemetry.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require_relative "../ext/telemetry"
+require_relative "../ext/test"
+require_relative "../utils/telemetry"
+
+module Datadog
+  module CI
+    module TestOptimisation
+      # Telemetry for test optimisation component
+      module Telemetry
+        def self.code_coverage_started(test)
+          Utils::Telemetry.inc(Ext::Telemetry::METRIC_CODE_COVERAGE_STARTED, 1, tags_for_test(test))
+        end
+
+        def self.code_coverage_finished(test)
+          Utils::Telemetry.inc(Ext::Telemetry::METRIC_CODE_COVERAGE_FINISHED, 1, tags_for_test(test))
+        end
+
+        def self.code_coverage_is_empty
+          Utils::Telemetry.inc(Ext::Telemetry::METRIC_CODE_COVERAGE_IS_EMPTY, 1)
+        end
+
+        def self.code_coverage_files(count)
+          Utils::Telemetry.distribution(Ext::Telemetry::METRIC_CODE_COVERAGE_FILES, count.to_f)
+        end
+
+        def self.code_coverage_errors
+          Utils::Telemetry.inc(Ext::Telemetry::METRIC_CODE_COVERAGE_ERRORS, 1)
+        end
+
+        def self.tags_for_test(test)
+          {
+            Ext::Telemetry::TAG_TEST_FRAMEWORK => test.get_tag(Ext::Test::TAG_FRAMEWORK),
+            Ext::Telemetry::TAG_LIBRARY => Ext::Telemetry::Library::CUSTOM
+          }
+        end
+      end
+    end
+  end
+end
diff --git a/sig/datadog/ci/ext/telemetry.rbs b/sig/datadog/ci/ext/telemetry.rbs
index 28b4f9e8..956a44c5 100644
--- a/sig/datadog/ci/ext/telemetry.rbs
+++ b/sig/datadog/ci/ext/telemetry.rbs
@@ -132,7 +132,7 @@ module Datadog
         end
 
         module Library
-          BUILTIN: "builtin"
+          CUSTOM: "custom"
         end
 
         module Endpoint
diff --git a/sig/datadog/ci/test_optimisation/telemetry.rbs b/sig/datadog/ci/test_optimisation/telemetry.rbs
new file mode 100644
index 00000000..9dbeb9a4
--- /dev/null
+++ b/sig/datadog/ci/test_optimisation/telemetry.rbs
@@ -0,0 +1,19 @@
+module Datadog
+  module CI
+    module TestOptimisation
+      module Telemetry
+        def self.code_coverage_started: (Datadog::CI::Test test) -> void
+
+        def self.code_coverage_finished: (Datadog::CI::Test test) -> void
+
+        def self.code_coverage_is_empty: () -> void
+
+        def self.code_coverage_files: (Integer count) -> void
+
+        def self.code_coverage_errors: () -> void
+
+        def self.tags_for_test: (Datadog::CI::Test test) -> ::Hash[String, String]
+      end
+    end
+  end
+end
diff --git a/spec/datadog/ci/test_optimisation/telemetry_spec.rb b/spec/datadog/ci/test_optimisation/telemetry_spec.rb
new file mode 100644
index 00000000..0077cf5e
--- /dev/null
+++ b/spec/datadog/ci/test_optimisation/telemetry_spec.rb
@@ -0,0 +1,96 @@
+# frozen_string_literal: true
+
+require_relative "../../../../lib/datadog/ci/test_optimisation/telemetry"
+
+RSpec.describe Datadog::CI::TestOptimisation::Telemetry do
+  describe ".code_coverage_started" do
+    subject(:code_coverage_started) { described_class.code_coverage_started(test) }
+
+    before do
+      expect(Datadog::CI::Utils::Telemetry).to receive(:inc)
+        .with(Datadog::CI::Ext::Telemetry::METRIC_CODE_COVERAGE_STARTED, 1, expected_tags)
+    end
+
+    let(:test) do
+      Datadog::Tracing::SpanOperation.new(
+        "test",
+        type: Datadog::CI::Ext::AppTypes::TYPE_TEST,
+        tags: {
+          Datadog::CI::Ext::Test::TAG_FRAMEWORK => "rspec"
+        }
+      )
+    end
+
+    let(:expected_tags) do
+      {
+        Datadog::CI::Ext::Telemetry::TAG_TEST_FRAMEWORK => "rspec",
+        Datadog::CI::Ext::Telemetry::TAG_LIBRARY => Datadog::CI::Ext::Telemetry::Library::CUSTOM
+      }
+    end
+
+    it { code_coverage_started }
+  end
+
+  describe ".code_coverage_finished" do
+    subject(:code_coverage_finished) { described_class.code_coverage_finished(test) }
+
+    before do
+      expect(Datadog::CI::Utils::Telemetry).to receive(:inc)
+        .with(Datadog::CI::Ext::Telemetry::METRIC_CODE_COVERAGE_FINISHED, 1, expected_tags)
+    end
+
+    let(:test) do
+      Datadog::Tracing::SpanOperation.new(
+        "test",
+        type: Datadog::CI::Ext::AppTypes::TYPE_TEST,
+        tags: {
+          Datadog::CI::Ext::Test::TAG_FRAMEWORK => "rspec"
+        }
+      )
+    end
+
+    let(:expected_tags) do
+      {
+        Datadog::CI::Ext::Telemetry::TAG_TEST_FRAMEWORK => "rspec",
+        Datadog::CI::Ext::Telemetry::TAG_LIBRARY => Datadog::CI::Ext::Telemetry::Library::CUSTOM
+      }
+    end
+
+    it { code_coverage_finished }
+  end
+
+  describe ".code_coverage_is_empty" do
+    subject(:code_coverage_is_empty) { described_class.code_coverage_is_empty }
+
+    before do
+      expect(Datadog::CI::Utils::Telemetry).to receive(:inc)
+        .with(Datadog::CI::Ext::Telemetry::METRIC_CODE_COVERAGE_IS_EMPTY, 1)
+    end
+
+    it { code_coverage_is_empty }
+  end
+
+  describe ".code_coverage_files" do
+    subject(:code_coverage_files) { described_class.code_coverage_files(count) }
+
+    let(:count) { 42 }
+
+    before do
+      expect(Datadog::CI::Utils::Telemetry).to receive(:distribution)
+        .with(Datadog::CI::Ext::Telemetry::METRIC_CODE_COVERAGE_FILES, count.to_f)
+    end
+
+    it { code_coverage_files }
+  end
+
+  describe ".code_coverage_errors" do
+    subject(:code_coverage_errors) { described_class.code_coverage_errors }
+
+    before do
+      expect(Datadog::CI::Utils::Telemetry).to receive(:inc)
+        .with(Datadog::CI::Ext::Telemetry::METRIC_CODE_COVERAGE_ERRORS, 1)
+    end
+
+    it { code_coverage_errors }
+  end
+end