diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 532693b3cf..353ecf6c45 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -102,7 +102,7 @@ jobs:
         run: |
           cargo install cargo-check-external-types@0.1.13
           cd ${{ matrix.example }}
-          cargo check-external-types --config allowed-external-types.toml
+          cargo check-external-types --all-features --config allowed-external-types.toml
   msrv:
     strategy:
       matrix:
diff --git a/opentelemetry-otlp/CHANGELOG.md b/opentelemetry-otlp/CHANGELOG.md
index 4ad96907a7..28038d3b60 100644
--- a/opentelemetry-otlp/CHANGELOG.md
+++ b/opentelemetry-otlp/CHANGELOG.md
@@ -3,6 +3,8 @@
 ## vNext
 
 - Update `tonic` dependency version to 0.13
+- Re-export `tonic` types under `tonic_types`
+  [2898](https://github.com/open-telemetry/opentelemetry-rust/pull/2898)
 
 ## 0.29.0
 
diff --git a/opentelemetry-otlp/allowed-external-types.toml b/opentelemetry-otlp/allowed-external-types.toml
index 2412d22715..7995873ee8 100644
--- a/opentelemetry-otlp/allowed-external-types.toml
+++ b/opentelemetry-otlp/allowed-external-types.toml
@@ -3,20 +3,16 @@
 # This is used with cargo-check-external-types to reduce the surface area of downstream crates from
 # the public API. Ideally this can have a few exceptions as possible.
 allowed_external_types = [
-    "opentelemetry::*",
     "opentelemetry_http::*",
     "opentelemetry_sdk::*",
-    # http is a pre 1.0 crate
-    "http::uri::InvalidUri",
-    "http::header::name::InvalidHeaderName",
-    "http::header::value::InvalidHeaderValue",
-    # prost is a pre 1.0 crate
-    "prost::error::EncodeError",
+    # serde
+    "serde::de::Deserialize",
+    "serde::ser::Serialize",
     # tonic is a pre 1.0 crate
-    "tonic::status::Code",
-    "tonic::status::Status",
     "tonic::metadata::map::MetadataMap",
+    "tonic::transport::channel::tls::ClientTlsConfig",
+    "tonic::transport::tls::Certificate",
+    "tonic::transport::tls::Identity",
     "tonic::transport::channel::Channel",
-    "tonic::transport::error::Error",
     "tonic::service::interceptor::Interceptor",
 ]
diff --git a/opentelemetry-otlp/src/lib.rs b/opentelemetry-otlp/src/lib.rs
index 7cb37a1780..86180e3e6f 100644
--- a/opentelemetry-otlp/src/lib.rs
+++ b/opentelemetry-otlp/src/lib.rs
@@ -450,3 +450,20 @@ pub enum Protocol {
 #[doc(hidden)]
 /// Placeholder type when no exporter pipeline has been configured in telemetry pipeline.
 pub struct NoExporterConfig(());
+
+/// Re-exported types from the `tonic` crate.
+#[cfg(feature = "grpc-tonic")]
+pub mod tonic_types {
+    /// Re-exported types from `tonic::metadata`.
+    pub mod metadata {
+        #[doc(no_inline)]
+        pub use tonic::metadata::MetadataMap;
+    }
+
+    /// Re-exported types from `tonic::transport`.
+    #[cfg(feature = "tls")]
+    pub mod transport {
+        #[doc(no_inline)]
+        pub use tonic::transport::{Certificate, ClientTlsConfig, Identity};
+    }
+}