Enum Expand 

pub enum Expand {
    Traces,
    Peers,
    Around(i64),
}

One step of a correlation walk.

Three, not section 7.3’s seven. by_trace and by_span are what a trace_id query already does, by_link and by_exemplar are edges the row itself carries out to the caller, and an expander with no caller is an expander with no test.

Variants

Traces

Widen the window to the full extent of the traces already in the frame.

A trace id says nothing about when, so a window taken from the row that matched usually cuts the trace in half — the log line that started the investigation is at the end of a request whose first span is 800 ms earlier. This is the fix, and it is why Around is not a substitute: the extent is measured, not guessed at.

Peers

Widen entities to everything that took part in the frame’s traces.

The service map, for one investigation rather than the whole store: which other services were involved in the traces this one took part in. Two hops over data already in the block, with no service map to maintain and no metrics-generator sidecar. Requires traces — with none, “everything that shared a trace with nothing” is every entity there is, and returning that would look like an answer.

Around(i64)

Widen the window by ±d nanoseconds, keeping everything else.

Trait Implementations

impl Clone for Expand

fn clone(&self) -> Expand

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Expand

impl Debug for Expand

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

Formats the value using the given formatter.

impl Eq for Expand

impl PartialEq for Expand

fn eq(&self, other: &Expand) -> 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 StructuralPartialEq for Expand