never allow fallback on resource exhausted

Reviewed By: JakobDegen

Differential Revision: D61268688

fbshipit-source-id: 8bb9cfe0fdfa1e6400dab4e402725417be9783ac

app/buck2_execute_impl/src/executors/hybrid.rs

@@ -243,12 +243,7 @@ where
                     CommandExecutionStatus::Error {
                         typ: CommandExecutionErrorType::StorageResourceExhausted,
                         ..
-                    } => {
-                        ignore_fallback_tracker
-                            || self
-                                .fallback_tracker
-                                .can_fallback_when_storage_resource_exhausted()
-                    }
+                    } => ignore_fallback_tracker,
                     // Errors are infra errors and are always retried because that is the point of
                     // falling back.
                     CommandExecutionStatus::Error { .. } => {
@@ -549,23 +544,6 @@ impl FallbackTracker {
         }
     }
 
-    pub fn can_fallback_when_storage_resource_exhausted(&self) -> bool {
-        #[cfg(all(fbcode_build, target_os = "linux"))]
-        if hostcaps::is_prod() {
-            justknobs::eval(
-                "buck2/buck2:allow_storage_resource_exhausted_fallback",
-                None,
-                None,
-            )
-            .unwrap_or(false)
-        } else {
-            false
-        }
-
-        #[cfg(not(all(fbcode_build, target_os = "linux")))]
-        false
-    }
-
     pub fn can_fallback(&self) -> bool {
         let retried = self.count_fallbacks.fetch_add(1, Ordering::Relaxed);