diff --git a/Steepfile b/Steepfile
index 27b00ccfc98..23076c9885e 100644
--- a/Steepfile
+++ b/Steepfile
@@ -93,25 +93,6 @@ target :datadog do
   ignore 'lib/datadog/core/pin.rb'
   ignore 'lib/datadog/core/runtime/ext.rb'
   ignore 'lib/datadog/core/runtime/metrics.rb'
-  ignore 'lib/datadog/core/telemetry/client.rb'
-  ignore 'lib/datadog/core/telemetry/collector.rb'
-  ignore 'lib/datadog/core/telemetry/emitter.rb'
-  ignore 'lib/datadog/core/telemetry/event.rb'
-  ignore 'lib/datadog/core/telemetry/ext.rb'
-  ignore 'lib/datadog/core/telemetry/heartbeat.rb'
-  ignore 'lib/datadog/core/telemetry/http/adapters/net.rb'
-  ignore 'lib/datadog/core/telemetry/http/env.rb'
-  ignore 'lib/datadog/core/telemetry/http/ext.rb'
-  ignore 'lib/datadog/core/telemetry/http/response.rb'
-  ignore 'lib/datadog/core/telemetry/http/transport.rb'
-  ignore 'lib/datadog/core/telemetry/v1/app_event.rb'
-  ignore 'lib/datadog/core/telemetry/v1/application.rb'
-  ignore 'lib/datadog/core/telemetry/v1/configuration.rb'
-  ignore 'lib/datadog/core/telemetry/v1/dependency.rb'
-  ignore 'lib/datadog/core/telemetry/v1/host.rb'
-  ignore 'lib/datadog/core/telemetry/v1/integration.rb'
-  ignore 'lib/datadog/core/telemetry/v1/product.rb'
-  ignore 'lib/datadog/core/telemetry/v1/telemetry_request.rb'
   ignore 'lib/datadog/core/transport/ext.rb'
   ignore 'lib/datadog/core/transport/http/adapters/net.rb'
   ignore 'lib/datadog/core/transport/http/adapters/registry.rb'
diff --git a/lib/datadog/core/telemetry/event.rb b/lib/datadog/core/telemetry/event.rb
index 40fa9d95554..49b292878bb 100644
--- a/lib/datadog/core/telemetry/event.rb
+++ b/lib/datadog/core/telemetry/event.rb
@@ -38,6 +38,7 @@ def payload(seq_id)
           private
 
           def products
+            # @type var products: Hash[Symbol, Hash[Symbol, Object]]
             products = {
               appsec: {
                 enabled: Datadog::AppSec.enabled?,
diff --git a/lib/datadog/core/telemetry/heartbeat.rb b/lib/datadog/core/telemetry/heartbeat.rb
index bf94318059a..b2129504e68 100644
--- a/lib/datadog/core/telemetry/heartbeat.rb
+++ b/lib/datadog/core/telemetry/heartbeat.rb
@@ -6,7 +6,7 @@
 module Datadog
   module Core
     module Telemetry
-      # Periodically (every DEFAULT_INTERVAL_SECONDS) sends a heartbeat event to the telemetry API.
+      # Periodically sends a heartbeat event to the telemetry API.
       class Heartbeat < Core::Worker
         include Core::Workers::Polling
 
diff --git a/sig/datadog/core.rbs b/sig/datadog/core.rbs
index 230abdce92e..410f4f2cd29 100644
--- a/sig/datadog/core.rbs
+++ b/sig/datadog/core.rbs
@@ -3,4 +3,5 @@ module Datadog
   end
 
   extend Core::Configuration
+  extend Tracing::Contrib::Extensions::Helpers
 end
diff --git a/sig/datadog/core/telemetry/client.rbs b/sig/datadog/core/telemetry/client.rbs
index bc572c05a87..9bd2f4a97cc 100644
--- a/sig/datadog/core/telemetry/client.rbs
+++ b/sig/datadog/core/telemetry/client.rbs
@@ -2,37 +2,37 @@ module Datadog
   module Core
     module Telemetry
       class Client
+        @enabled: bool
         @dependency_collection: bool
         @started: bool
         @stopped: bool
-
-        attr_reader emitter: untyped
+        @emitter: Datadog::Core::Telemetry::Emitter
+        @unsupported: bool
+        @worker: Datadog::Core::Telemetry::Heartbeat
 
         attr_reader enabled: bool
 
         attr_reader unsupported: bool
 
-        attr_reader worker: untyped
-
         include Core::Utils::Forking
 
         def initialize: (heartbeat_interval_seconds: Numeric, dependency_collection: bool, enabled: bool) -> void
 
-        def disable!: () -> untyped
+        def disable!: () -> void
 
         def client_configuration_change!: (Enumerable[[String, Numeric | bool | String]] changes) -> void
 
-        def started!: () -> (nil | untyped)
+        def started!: () -> void
 
-        def emit_closing!: () -> (nil | untyped)
+        def emit_closing!: () -> void
 
-        def stop!: () -> (nil | untyped)
+        def stop!: () -> void
 
-        def integrations_change!: () -> (nil | untyped)
+        def integrations_change!: () -> void
 
         private
 
-        def heartbeat!: () -> (nil | untyped)
+        def heartbeat!: () -> void
       end
     end
   end
diff --git a/sig/datadog/core/telemetry/emitter.rbs b/sig/datadog/core/telemetry/emitter.rbs
index fa1eb05534d..e1d4320d763 100644
--- a/sig/datadog/core/telemetry/emitter.rbs
+++ b/sig/datadog/core/telemetry/emitter.rbs
@@ -8,7 +8,7 @@ module Datadog
 
         extend Core::Utils::Forking
         def initialize: (?http_transport: untyped) -> void
-        def request: (String request_type, data: Object?) -> Datadog::Core::Telemetry::Http::Adapters::Net::Response
+        def request: (Datadog::Core::Telemetry::Event::Base event) -> Datadog::Core::Telemetry::Http::Adapters::Net::Response
         def self.sequence: () -> untyped
       end
     end
diff --git a/sig/datadog/core/telemetry/event.rbs b/sig/datadog/core/telemetry/event.rbs
index ba45df34aba..4e0e3824109 100644
--- a/sig/datadog/core/telemetry/event.rbs
+++ b/sig/datadog/core/telemetry/event.rbs
@@ -3,8 +3,57 @@ module Datadog
     module Telemetry
       class Event
         class Base
-          def payload: (int seq_id) -> ::Hash[Symbol, Object]
-          def type: -> string
+          def payload: (int seq_id) -> Hash[Symbol, untyped]
+          def type: -> String?
+        end
+
+        class AppStarted < Base
+          TARGET_OPTIONS: Array[String]
+
+          @seq_id: int
+
+          private
+
+          def products: -> Hash[Symbol, untyped]
+
+          def configuration: -> Array[Hash[Symbol, untyped]]
+
+          def agent_transport: (untyped config) -> String
+
+          def conf_value: (String name, Object value, ?String origin) -> Hash[Symbol, untyped]
+
+          def to_value: (Object value) -> Object
+
+          def install_signature: -> Hash[Symbol, Object]
+        end
+
+        class AppDependenciesLoaded < Base
+          private
+
+          def dependencies: -> Array[Hash[Symbol, String]]
+        end
+
+        class AppIntegrationsChange < Base
+          private
+
+          def integrations: -> Array[Hash[Symbol, string]]
+
+          def patch_error: (untyped integration) -> String
+        end
+
+        class AppClientConfigurationChange < Base
+          @changes: Enumerable[[String, Numeric | bool | String | int]]
+          @origin: String
+
+          def initialize: (Enumerable[[String, Numeric | bool | String]] changes, String origin) -> void
+
+          def configuration: (int seq_id) -> Array[Hash[Symbol, untyped]]
+        end
+
+        class AppHeartbeat < Base
+        end
+
+        class AppClosing < Base
         end
       end
     end
diff --git a/sig/datadog/core/telemetry/heartbeat.rbs b/sig/datadog/core/telemetry/heartbeat.rbs
index e1fcaae79fe..b89aeedca8b 100644
--- a/sig/datadog/core/telemetry/heartbeat.rbs
+++ b/sig/datadog/core/telemetry/heartbeat.rbs
@@ -3,16 +3,17 @@ module Datadog
     module Telemetry
       class Heartbeat < Core::Worker
         include Core::Workers::Polling
+        include Core::Workers::Async::Thread
+        include Core::Workers::Async::Thread::PrependedMethods
+        include Core::Workers::IntervalLoop
 
-        DEFAULT_INTERVAL_SECONDS: 60
+        def initialize: (?enabled: bool, heartbeat_interval_seconds: Numeric) ?{ () -> void } -> void
 
-        def initialize: (?enabled: bool, ?interval: untyped) ?{ () -> untyped } -> void
-
-        def loop_wait_before_first_iteration?: () -> true
+        def loop_wait_before_first_iteration?: () -> bool?
 
         private
 
-        def start: () -> untyped
+        def start: () -> void
       end
     end
   end
diff --git a/sig/datadog/core/telemetry/http/adapters/net.rbs b/sig/datadog/core/telemetry/http/adapters/net.rbs
index e3e57cf0acf..5cf50e53adf 100644
--- a/sig/datadog/core/telemetry/http/adapters/net.rbs
+++ b/sig/datadog/core/telemetry/http/adapters/net.rbs
@@ -4,21 +4,24 @@ module Datadog
       module Http
         module Adapters
           class Net
-            attr_reader hostname: untyped
+            type response = Datadog::Core::Telemetry::Http::Adapters::Net::Response | ::Datadog::Core::Telemetry::Http::InternalErrorResponse
 
-            attr_reader port: untyped
+            attr_reader hostname: String
 
-            attr_reader timeout: untyped
+            attr_reader port: Integer?
 
-            attr_reader ssl: untyped
+            attr_reader timeout: Float | Integer
+
+            attr_reader ssl: bool
 
             DEFAULT_TIMEOUT: 30
 
-            def initialize: (hostname: untyped, ?port: untyped?, ?timeout: untyped, ?ssl: bool) -> void
+            def initialize: (hostname: String, ?port: Integer?, ?timeout: Float | Integer, ?ssl: bool?) -> void
+
+            def open: () { (::Net::HTTP http) -> ::Net::HTTPResponse } -> untyped
 
-            def open: () ?{ () -> untyped } -> untyped
+            def post: (untyped env) -> response
 
-            def post: (untyped env) -> Datadog::Core::Telemetry::Http::Adapters::Net::Response
             class Response
               include Datadog::Core::Telemetry::Http::Response
 
diff --git a/sig/datadog/core/telemetry/http/ext.rbs b/sig/datadog/core/telemetry/http/ext.rbs
index d471905fe2f..22cea7d1fd0 100644
--- a/sig/datadog/core/telemetry/http/ext.rbs
+++ b/sig/datadog/core/telemetry/http/ext.rbs
@@ -13,6 +13,12 @@ module Datadog
 
           HEADER_DD_TELEMETRY_REQUEST_TYPE: "DD-Telemetry-Request-Type"
 
+          HEADER_CLIENT_LIBRARY_LANGUAGE: "DD-Client-Library-Language"
+
+          HEADER_CLIENT_LIBRARY_VERSION: "DD-Client-Library-Version"
+
+          HEADER_TELEMETRY_DEBUG_ENABLED: "DD-Telemetry-Debug-Enabled"
+
           CONTENT_TYPE_APPLICATION_JSON: "application/json"
 
           API_VERSION: "v1"
diff --git a/sig/datadog/core/telemetry/http/response.rbs b/sig/datadog/core/telemetry/http/response.rbs
index 95e92044cae..4113c007214 100644
--- a/sig/datadog/core/telemetry/http/response.rbs
+++ b/sig/datadog/core/telemetry/http/response.rbs
@@ -9,6 +9,8 @@ module Datadog
 
           def unsupported?: () -> nil
 
+          def code: () -> nil
+
           def not_found?: () -> nil
 
           def client_error?: () -> nil
diff --git a/sig/datadog/core/telemetry/http/transport.rbs b/sig/datadog/core/telemetry/http/transport.rbs
index 2a707e66e48..d6ac33f5a40 100644
--- a/sig/datadog/core/telemetry/http/transport.rbs
+++ b/sig/datadog/core/telemetry/http/transport.rbs
@@ -3,23 +3,25 @@ module Datadog
     module Telemetry
       module Http
         class Transport
-          attr_reader host: untyped
+          @adapter: Http::Adapters::Net
 
-          attr_reader port: untyped
+          attr_reader host: String
 
-          attr_reader ssl: untyped
+          attr_reader port: Integer
 
-          attr_reader path: untyped
+          attr_reader ssl: bool
+
+          attr_reader path: String
 
           def initialize: () -> void
 
-          def request: (request_type: String, payload: String) -> Datadog::Core::Telemetry::Http::Adapters::Net::Response
+          def request: (request_type: String, payload: String) -> Datadog::Core::Telemetry::Http::Adapters::Net::response
 
           private
 
           def headers: (request_type: untyped, ?api_version: untyped) -> ::Hash[untyped, untyped]
 
-          def adapter: () -> untyped
+          def adapter: () -> Http::Adapters::Net
         end
       end
     end
diff --git a/sig/datadog/core/transport/ext.rbs b/sig/datadog/core/transport/ext.rbs
index 8be8ba0bbbb..335e293b941 100644
--- a/sig/datadog/core/transport/ext.rbs
+++ b/sig/datadog/core/transport/ext.rbs
@@ -24,6 +24,8 @@ module Datadog
           HEADER_META_LANG_INTERPRETER: ::String
 
           HEADER_META_TRACER_VERSION: ::String
+
+          HEADER_DD_INTERNAL_UNTRACED_REQUEST: ::String
         end
 
         module Test
diff --git a/sig/datadog/core/worker.rbs b/sig/datadog/core/worker.rbs
index 7c59eb58d60..5654f60e88d 100644
--- a/sig/datadog/core/worker.rbs
+++ b/sig/datadog/core/worker.rbs
@@ -1,6 +1,7 @@
 module Datadog
   module Core
     class Worker
+      def initialize: () ?{ () -> void } -> void
     end
   end
 end