observation

const (
	// Preparation resolves instructions, destinations and required resources.
	Preparation Phase = 0
	// InputInspection captures and inspects sources, which can overlap.
	InputInspection Phase = 1
	// Layout measures or renders distinct generated specifications.
	Layout Phase = 2
	// Assembly imports source occurrences and compiles output pages.
	Assembly Phase = 3
	// Optimization enters the backend optimizer.
	Optimization Phase = 4
	// OutputWriting writes the staged PDF once.
	OutputWriting Phase = 5
	// OutputVerification reads and verifies the staged output.
	OutputVerification Phase = 6
	// Publication stages and publishes requested deliverables.
	Publication Phase = 7
	// Finalization includes workspace cleanup and report salvage.
	Finalization Phase = 8
	// PhaseCount bounds consumer state; it is not a valid phase.
	PhaseCount Phase = 9

	// UnitNone denotes an indeterminate milestone without a counter.
	UnitNone Unit = 0
	// CapturedSources counts successfully captured distinct PDF sources.
	CapturedSources Unit = 1
	// ProcessedSources counts returned source attempts, including failures.
	ProcessedSources Unit = 2
	// ProcessedGeneratedSpecs counts returned layout/render spec attempts.
	ProcessedGeneratedSpecs Unit = 3
	// ImportedSources counts actual successful source-document imports,
	// including per-occurrence reimports but excluding generated resources.
	ImportedSources Unit = 4
	// CompiledPages counts actual output-page placements.
	CompiledPages Unit = 5
	// UnitCount bounds consumer state; it is not a valid unit.
	UnitCount Unit = 6
)