feat: add HTTP endpoint to control prof.gdump feature (#6999)

* feat/gdump:
 ### Add Support for Jemalloc Gdump Flag

 - **`jemalloc.rs`**: Introduced `PROF_GDUMP` constant and added functions `set_gdump_active` and `is_gdump_active` to manage the gdump flag.
 - **`error.rs`**: Added error handling for reading and updating the jemalloc gdump flag with `ReadGdump` and `UpdateGdump` errors.
 - **`lib.rs`**: Exposed `is_gdump_active` and `set_gdump_active` functions for non-Windows platforms.
 - **`http.rs`**: Added HTTP routes for checking and toggling the jemalloc gdump flag status.
 - **`mem_prof.rs`**: Implemented handlers `gdump_toggle_handler` and `gdump_status_handler` for managing gdump flag via HTTP requests.

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

* Update docs/how-to/how-to-profile-memory.md

Co-authored-by: shuiyisong <113876041+shuiyisong@users.noreply.github.com>

* fix: typo in docs

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

---------

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>
Co-authored-by: shuiyisong <113876041+shuiyisong@users.noreply.github.com>

src/servers/src/http.rs

@@ -924,6 +924,11 @@ impl HttpServer {
                             .route(
                                 "/mem/status",
                                 routing::get(mem_prof::heap_prof_status_handler),
+                            ) // jemalloc gdump flag status and toggle
+                            .route(
+                                "/mem/gdump",
+                                routing::get(mem_prof::gdump_status_handler)
+                                    .post(mem_prof::gdump_toggle_handler),
                             ),
                     ),
             ))

src/servers/src/http/mem_prof.rs

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#[cfg(feature = "mem-prof")]
+use axum::Form;
 #[cfg(feature = "mem-prof")]
 use axum::extract::Query;
 use axum::http::StatusCode;
@@ -127,3 +129,57 @@ pub async fn heap_prof_status_handler() -> crate::error::Result<impl IntoRespons
         "The 'mem-prof' feature is disabled",
     ))
 }
+
+#[cfg(feature = "mem-prof")]
+#[derive(Deserialize)]
+pub struct GdumpToggleForm {
+    activate: bool,
+}
+
+#[cfg(feature = "mem-prof")]
+#[axum_macros::debug_handler]
+pub async fn gdump_toggle_handler(
+    Form(form): Form<GdumpToggleForm>,
+) -> crate::error::Result<impl IntoResponse> {
+    use snafu::ResultExt;
+
+    use crate::error::DumpProfileDataSnafu;
+
+    common_mem_prof::set_gdump_active(form.activate).context(DumpProfileDataSnafu)?;
+
+    let msg = if form.activate {
+        "gdump activated"
+    } else {
+        "gdump deactivated"
+    };
+    Ok((StatusCode::OK, msg))
+}
+
+#[cfg(not(feature = "mem-prof"))]
+#[axum_macros::debug_handler]
+pub async fn gdump_toggle_handler() -> crate::error::Result<impl IntoResponse> {
+    Ok((
+        StatusCode::NOT_IMPLEMENTED,
+        "The 'mem-prof' feature is disabled",
+    ))
+}
+
+#[cfg(feature = "mem-prof")]
+#[axum_macros::debug_handler]
+pub async fn gdump_status_handler() -> crate::error::Result<impl IntoResponse> {
+    use snafu::ResultExt;
+
+    use crate::error::DumpProfileDataSnafu;
+
+    let is_active = common_mem_prof::is_gdump_active().context(DumpProfileDataSnafu)?;
+    Ok((StatusCode::OK, format!("{{\"active\": {}}}", is_active)))
+}
+
+#[cfg(not(feature = "mem-prof"))]
+#[axum_macros::debug_handler]
+pub async fn gdump_status_handler() -> crate::error::Result<impl IntoResponse> {
+    Ok((
+        StatusCode::NOT_IMPLEMENTED,
+        "The 'mem-prof' feature is disabled",
+    ))
+}