Struct MetricEncoder 

pub struct MetricEncoder { /* private fields */ }

A writer that groups metrics by family name and deduplicates HELP/TYPE metadata during Prometheus encoding.

When the same metric is registered across scoped registries (via Registry::encode), prometheus_client outputs each scope’s metrics separately, interleaving families. This writer collects all lines and regroups them so that every sample for a given metric name appears together with a single HELP/TYPE header.

Also strips # EOF lines so that Registry::encode can append exactly one at the end of the combined output.

Uses “first wins” semantics: keeps the first HELP/TYPE description encountered for each metric name and discards subsequent duplicates.

Implementations

impl MetricEncoder

pub const fn new() -> Self

pub fn into_string(self) -> String

Trait Implementations

impl Default for MetricEncoder

fn default() -> Self

Returns the “default value” for a type.

impl Write for MetricEncoder

fn write_str(&mut self, s: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a char into this writer, returning whether the write succeeded.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Glue for usage of the write! macro with implementors of this trait.