Enum MetricEvent 

pub enum MetricEvent {
    FlowCreated,
    FlowEvicted,
    FlowShed,
    FlowShedSourceLimit,
    DatagramIn(usize),
    DatagramOut(usize),
    DatagramDropped(DropReason),
}

Metric events the core asks the shell to record. The shell owns the incr!/count!/gauge!/time! macros (lib/src/metrics/).

protocol::mux::h2’s MetricEvent is a different type with the same name, and deliberately so: it carries the H2 core’s own vocabulary and shares no variant with this one. Converging them would put H2 connection gauges inside Output::Metric, which every consumer of this enum would then have to match on. The shared name is the same idiom crate::protocol::tcp_preread::Output and Output already use.

Variants

FlowCreated

A new flow was admitted (udp.flows.created, udp.active_flows += 1).

FlowEvicted

A flow was torn down by idle/teardown/drain (udp.flows.evicted, udp.active_flows -= 1).

FlowShed

A new flow was shed at the cap (udp.flows.shed).

FlowShedSourceLimit

A new flow was shed because its source address or subnet already holds the cluster’s per-source flow limit (udp.flows.shed and udp.flows.shed.source_limit).

DatagramIn(usize)

A client→backend datagram was forwarded (udp.datagrams.in, udp.bytes.in). Carries the payload byte count (excludes any PPv2 prefix the core adds).

DatagramOut(usize)

A backend→client datagram was returned (udp.datagrams.out, udp.bytes.out).

DatagramDropped(DropReason)

A datagram was dropped, by reason (udp.datagrams.dropped).

Trait Implementations

impl Clone for MetricEvent

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MetricEvent

impl Debug for MetricEvent

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

Formats the value using the given formatter.

impl Eq for MetricEvent

impl PartialEq for MetricEvent

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MetricEvent