Enum ParameterScope 

pub enum ParameterScope {
    Environment,
    Cluster,
    Replica,
}

The scope at which a synced parameter’s value may be overridden.

Every synced parameter declares its scope class as part of its definition. The declaration is the single source of truth for which contexts the LaunchDarkly sync loop evaluates and where the resolved value may be overridden. See doc/developer/design/20260609_scoped_feature_flags.md.

Variants

Environment

Environment-wide only; no cluster/replica overrides. The default, so all existing synced parameters are unchanged.

Cluster

Cluster-coherent: env-wide base plus per-cluster overrides. Evaluated with the cluster context (replica-free) and resolved at plan time via OptimizerFeatureOverrides. e.g. optimizer features.

Replica

Replica-local: env-wide base plus per-replica / per-size-family overrides. Evaluated with the replica context and resolved at the controller’s per-replica dyncfg push. e.g. lgalloc, persist pager, LZ4.

Implementations

impl ParameterScope

pub const DEFAULT: ParameterScope = ParameterScope::Environment

The scope applied to a parameter that does not declare one: environment- wide, i.e. no cluster/replica overrides. A const so it can be used in the const contexts (system-var constructors, the feature_flags! macro) where Default::default is unavailable.

pub const fn as_str(&self) -> &'static str

Returns the lowercase string name of this scope, as surfaced in documentation and introspection.

Trait Implementations

impl Clone for ParameterScope

fn clone(&self) -> ParameterScope

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ParameterScope

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ParameterScope

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for ParameterScope

fn eq(&self, other: &ParameterScope) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ParameterScope

impl Eq for ParameterScope

impl StructuralPartialEq for ParameterScope