Struct Meta 

pub struct Meta {
    pub key: Option<String>,
    pub source_id: String,
    pub timestamp_ms: u64,
    pub headers: HashMap<String, String>,
}

Per-envelope metadata.

key is populated by the source when available (e.g., Kafka record key) or by a transform like SetKeyTransform. Sinks that require a key (like KafkaSink) fall back to source_id when key is None.

Fields

key: Option<String>

source_id: String

timestamp_ms: u64

headers: HashMap<String, String>

Trait Implementations

impl Clone for Meta

fn clone(&self) -> Meta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Meta

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

Formats the value using the given formatter.

impl Default for Meta

fn default() -> Meta

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Meta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Meta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.