Disable child metric registration under parent to prevent OOM

Author: sgrebnov

vortex-metrics/src/lib.rs

@@ -82,7 +82,9 @@ impl VortexMetrics {
     /// child registry will be included in this registry's snapshots.
     pub fn child_with_tags(&self, additional_tags: impl Into<DefaultTags>) -> Self {
         let child = Self::new_with_tags(self.inner.default_tags.merge(&additional_tags.into()));
-        self.inner.children.write().push(child.clone());
+        // TODO: Temporarily disabled due to memory growth: children accumulate indefinitely
+        // https://github.com/vortex-data/vortex/discussions/5946
+        // self.inner.children.write().push(child.clone());
         child
     }