Struct SessionMetadata 

pub struct SessionMetadata {
    pub event_type_histogram: BTreeMap<String, u64>,
    pub first_event_time: Option<String>,
    pub last_event_time: Option<String>,
    pub has_errors: bool,
}

Pre-computed aggregate statistics attached to a v2 session archive header.

Computed once during archive write by a single-pass scan of the event store. Readers can answer has_errors, histogram, and first/last timestamp queries without iterating the event stream — enabling cheap triage, sampling, and listing of many archives.

BTreeMap for the histogram guarantees deterministic JSON key order (matches Java’s TreeMap and TypeScript’s alphabetical sort).

Fields

event_type_histogram: BTreeMap<String, u64>

first_event_time: Option<String>

last_event_time: Option<String>

has_errors: bool

Implementations

impl SessionMetadata

pub fn empty() -> Self

Returns a SessionMetadata with no data. Used as a default for empty sessions and as the fallback for v1 archive imports.

Trait Implementations

impl Clone for SessionMetadata

fn clone(&self) -> SessionMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SessionMetadata

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

Formats the value using the given formatter.

impl Default for SessionMetadata

fn default() -> SessionMetadata

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SessionMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SessionMetadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.