Enum MetricsError 

pub enum MetricsError {
    CircuitOpen,
    Overloaded,
    InvalidName,
    InvalidValue {
        reason: &'static str,
    },
    Overflow,
    Underflow,
    OverLimit,
    WouldBlock,
    NotInitialized,
    CardinalityExceeded,
    Config(String),
}

Metrics errors

Variants

CircuitOpen

Circuit breaker is open and the operation is not allowed.

Overloaded

System is overloaded (e.g., adaptive sampler reduced acceptance) and rejected the operation.

InvalidName

Invalid metric name (empty, overly long, or otherwise rejected by a policy).

InvalidValue

Invalid value supplied (NaN, non-finite, out-of-range, or otherwise invalid).

Fields

reason: &'static str

Short, static explanation of why the value was invalid (e.g., “value is not finite”).

Overflow

Arithmetic would overflow the counter or index (checked variants only).

Underflow

Arithmetic would underflow (checked variants only).

OverLimit

Operation would exceed a configured limit (rate limiting, quotas, etc.).

WouldBlock

Operation would block and a non-blocking/try path was requested.

NotInitialized

Global metrics were not initialized and the operation requires initialization.

CardinalityExceeded

Registering this (name, labels) combination would exceed the configured cardinality cap. The try_*_with lookup variants return this error; the non-try variants route to a per-type sink instead (see Registry::set_cardinality_cap).

Config(String)

Configuration error with details.

Trait Implementations

impl Clone for MetricsError

fn clone(&self) -> MetricsError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetricsError

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

Formats the value using the given formatter.

impl Display for MetricsError

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

Formats the value using the given formatter.

impl Error for MetricsError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for MetricsError

fn eq(&self, other: &MetricsError) -> 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 StructuralPartialEq for MetricsError