Split the five telemetry<signal> packages, which mixed three concerns, into
three per-signal layers with a cycle-free dependency direction:
- telemetryschema/<signal>telemetryschema — primitives (const + table
selection, field_mapper, condition_builder, trace helpers); leaf layer.
- statementbuilder/<signal>statementbuilder — SQL generation. The parent
statementbuilder package is contract-only (the Builders bundle + Config);
each sub-package exposes a factory.ProviderFactory[..., statementbuilder.Config]
whose New internalizes FieldMapper/ConditionBuilder/AggExprRewriter and reads
SkipResourceFingerprint. Traces exposes two factories (query + operator).
telemetryresourcefilter moves here as statementbuilder/resourcefilter.
- telemetrymetadata — key/value resolution; NewTelemetryMetaStore collapses
from 24 args to (settings, telemetrystore, flagger), sourcing table names
from the schema constants.
Centralize query-stack assembly in signoz.go via newQueryStack: build the
single metadata store, run each per-signal statement-builder factory, assemble
the statementbuilder.Builders bundle, and build the bucket cache — once. This
is the only place that imports the concrete sub-packages (so the edge runs
subs -> parent, cycle-free), and it removes the duplicate metadata store that
signozquerier used to build, leaving signozquerier a thin
querier.New(*statementbuilder.Builders) adapter.
Also:
- statementbuilder.Config owns SkipResourceFingerprint (moved off
querier.Config). YAML key moves querier.skip_resource_fingerprint ->
statementbuilder.skip_resource_fingerprint.
- Querier interface moves into querier.go (interfaces.go removed); BucketCache
-> bucket_cache.go, Handler -> api.go.
- Add pkg/querier/queriertest.MockQuerier.
