Struct VarlinkUsage 

pub struct VarlinkUsage {
    pub version: Option<CollectorTransport>,
    pub system_state: Option<CollectorTransport>,
    pub units: Option<CollectorTransport>,
    pub networkd: Option<CollectorTransport>,
    pub machines: Option<CollectorTransport>,
    pub boot_blame: Option<CollectorTransport>,
    pub verify: Option<CollectorTransport>,
}

Per-collector transport record for the last collection run.

Every field is Some when its collector ran and None when it did not (disabled in config). Absent-when-disabled is what makes the adoption ratio work: count() over the gauges is the enabled set.

NOTE for future collectors: the host MachineStats is constructed once outside the daemon loop, not fresh each iteration — so a collector with an early-return path that skips its gauge assignment would silently inherit the previous run’s value instead of dropping the gauge. Always assign on every path, including cache hits and config-disabled fallbacks.

Fields

version: Option<CollectorTransport>

Always collected; follows [system-state] varlink via the shared Manager.Describe call. Normally agrees with system_state (one call serves both), but persists when [system-state] is disabled — making it the cheapest varlink canary on such hosts.

system_state: Option<CollectorTransport>

units: Option<CollectorTransport>

Varlink means the bulk enumeration came from the metrics stream and per-unit details from io.systemd.Unit.List, on the host and inside containers alike.

networkd: Option<CollectorTransport>

machines: Option<CollectorTransport>

Host-side machine enumeration: machined’s io.systemd.Machine.List (systemd v257+) or its D-Bus API. Per-container transports land on each machine’s own MachineStats instead.

boot_blame: Option<CollectorTransport>

verify: Option<CollectorTransport>

Trait Implementations

impl Clone for VarlinkUsage

fn clone(&self) -> VarlinkUsage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VarlinkUsage

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

Formats the value using the given formatter.

impl Default for VarlinkUsage

fn default() -> VarlinkUsage

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for VarlinkUsage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for VarlinkUsage

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for VarlinkUsage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for VarlinkUsage