Struct Metadata

pub struct Metadata(/* private fields */);

Metadata for a metric.

Metrics can have arbitrary key-value pairs stored as metadata. This allows for labelling them with whatever metadata you may find relevant.

Implementations

impl Metadata

pub fn new(map: HashMap<String, String>) -> Self

Create a new metadata map from a hashmap.

pub fn is_empty(&self) -> bool

Indicates whether this metadata instance is empty.

pub fn len(&self) -> usize

Get the number of entries contained within this metadata instance.

pub fn contains_key(&self, key: &str) -> bool

Determins if key is in Metadata.

pub fn get(&self, key: &str) -> Option<&str>

Get the value that key corresponds to.

pub fn iter(&self) -> MetadataIter<'_>

Return an iterator over the entries of this Metadata.

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metadata

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

Formats the value using the given formatter.

impl Default for Metadata

fn default() -> Self

Returns the “default value” for a type.

impl From<HashMap<String, String>> for Metadata

fn from(value: HashMap<String, String>) -> Self

Converts to this type from the input type.

impl<'a> IntoIterator for &'a Metadata

type Item = (&'a str, &'a str)

The type of the elements being iterated over.

type IntoIter = MetadataIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.