feat(ddtelemetry): filled kernel information

Author: Aaalibaba42

Cargo.lock

@@ -33,6 +33,7 @@ hashbrown = "0.15"
 
 ddcommon = { path = "../ddcommon", default-features = false }
 datadog-ddsketch = { path = "../ddsketch" }
+libc = "0.2.176"
 
 [dev-dependencies]
 tracing-subscriber = "0.3.18"

ddtelemetry/Cargo.toml

@@ -2,6 +2,8 @@
 // SPDX-License-Identifier: Apache-2.0
 
 pub mod os {
+    use std::ffi::CStr;
+
     // TODO: this function will call API's (fargate, k8s, etc) in the future to get to real host API
     pub fn real_hostname() -> anyhow::Result<String> {
         Ok(sys_info::hostname()?)
@@ -14,4 +16,30 @@ pub mod os {
     pub fn os_version() -> anyhow::Result<String> {
         sys_info::os_release().map_err(|e| e.into())
     }
+
+    pub fn os_type() -> Option<String> {
+        match sys_info::os_type() {
+            Ok(os_type) => Some(os_type),
+            Err(_) => None,
+        }
+    }
+
+    pub fn os_release() -> Option<String> {
+        match sys_info::os_release() {
+            Ok(os_release) => Some(os_release),
+            Err(_) => None,
+        }
+    }
+
+    pub unsafe fn uname() -> Option<String> {
+        let mut n = std::mem::zeroed();
+        match libc::uname(&mut n) {
+            0 => Some(
+                CStr::from_ptr((&n.version[..]).as_ptr())
+                    .to_string_lossy()
+                    .into_owned(),
+            ),
+            _ => None,
+        }
+    }
 }

ddtelemetry/src/info.rs

@@ -37,8 +37,8 @@ pub fn build_host() -> data::Host {
         container_id,
         os: Some(String::from(info::os::os_name())),
         os_version,
-        kernel_name: None,
-        kernel_release: None,
-        kernel_version: None,
+        kernel_name: info::os::os_type(),
+        kernel_release: info::os::os_release(),
+        kernel_version: unsafe { info::os::uname() },
     }
 }