The bridge half for statifier_oban's event family,
[:statifier_oban, ...] - what happens between a chart's delayed send
or invoke and the durable job row, frozen by that package's
docs/adr/0006-telemetry-events-for-the-durable-seams.md and tabulated
in its docs/telemetry.md.
A separate setup call, per st-ADR-0062 and ots-ADR-0002
decision 2:
OpentelemetryStatifier.setup()
OpentelemetryStatifier.Oban.setup()This module bridges statifier_oban's eleven events and nothing else.
Oban's own [:oban, :job, ...] spans are opentelemetry_oban's to
produce, and a host wanting both attaches both - the reason
statifier_oban deliberately emits no duration, no attempt timing and
no queue wait is that Oban already does.
What it produces
Every event in this family is a point - that contract has no
:start/:stop pairs, because Oban owns every interval it could
bracket - and the two seams land differently, exactly as the contract
describes:
- The scheduling seam (
:scheduled,:schedule_rejected,:cancelled,:enqueued,:enqueue_rejectedand the invoke:cancelled) fires synchronously on the process that drove the macrostep. When that macrostep's span is open in that same process, these become span events on it: the chart's decision and its durable consequence in one span. - The delivery seam (
:fired, the two:discarded,:delivered,:failed) fires inside an Oban job, days later and usually on another node. Those become their own spans, linked to the trace that armed the timer throughcaller_contextwhen the host stamped a W3Ctraceparentthere. A link and never a parent: parenthood would hold the arming trace open for the length of the delay. With nocaller_context, the span is simply unlinked - the ordinary detached case, correlated bystatifier.session_id.
scope is the correlation key here (it is either a live session's id
or a host's durable run id, and this package cannot tell which), and it
maps onto statifier.session_id - the rename happens here, once, where
the mapping is visible, exactly as statifier_oban's note asks.
The event list
The 11 names below are literal here rather than read from
StatifierOban.Telemetry.events/0, for the reason
OpentelemetryStatifier.Persistence's moduledoc gives: bridging a
sibling must not make that sibling - and Oban, and a database - a
dependency of every host that wants statechart tracing. ots-41k
carries the automatic drift test.
Summary
Functions
The event names this module attaches to - statifier_oban's family, in
full.
Validates opts into a OpentelemetryStatifier.Config.t() and attaches
this module's handler to every name events/0 returns, one
:telemetry.attach/4 call per name under a per-event handler id
(ADR-0003 decision 2). Idempotent, and independent of the other setups:
it detaches and attaches nothing outside its own family.
Detaches every handler id this module owns. Always returns :ok, even
when nothing was attached.
Functions
@spec events() :: [:telemetry.event_name()]
The event names this module attaches to - statifier_oban's family, in
full.
Examples
iex> length(OpentelemetryStatifier.Oban.events())
11@spec setup() :: :ok | {:error, term()}
Attaches this family with default options. Delegates to setup/1.
Examples
iex> OpentelemetryStatifier.Oban.setup()
:okValidates opts into a OpentelemetryStatifier.Config.t() and attaches
this module's handler to every name events/0 returns, one
:telemetry.attach/4 call per name under a per-event handler id
(ADR-0003 decision 2). Idempotent, and independent of the other setups:
it detaches and attaches nothing outside its own family.
@spec teardown() :: :ok
Detaches every handler id this module owns. Always returns :ok, even
when nothing was attached.