enhancement(observability): Log underlying error for unhandled HTTP errors (#17327)

To help with debugging

Signed-off-by: Jesse Szwedko <[email protected]>

Author: jszwedko

src/internal_events/http.rs

@@ -130,11 +130,11 @@ impl<'a> InternalEvent for HttpDecompressError<'a> {
     }
 }
 
-pub struct HttpInternalError {
-    pub message: &'static str,
+pub struct HttpInternalError<'a> {
+    pub message: &'a str,
 }
 
-impl InternalEvent for HttpInternalError {
+impl<'a> InternalEvent for HttpInternalError<'a> {
     fn emit(self) {
         error!(
             message = %self.message,

src/sources/util/http/prelude.rs

@@ -165,7 +165,7 @@ pub trait HttpSource: Clone + Send + Sync + 'static {
                 } else {
                     //other internal error - will return 500 internal server error
                     emit!(HttpInternalError {
-                        message: "Internal error."
+                        message: &format!("Internal error: {:?}", r)
                     });
                     Err(r)
                 }