build(sketchcollector): wire asap-precompute-go replace directive

[zzylol]

Why this PR

The OTel collector distribution sketchcollector is assembled by OCB from opentelemetry-collector-contrib-patch/cmd/sketchcollector/builder-config.yaml. It bundles all five sketch processors (ddsketch, KLL, HLL, countsketch, countminsketch) plus their merge variants into a single binary.

After Phase 2 shim refactors landed in #226 - #230, every sketch processor's go.mod now requires the private module github.com/ProjectASAP/asap-precompute-go. That module does not exist on the public Go proxy / sum.golang.org, so the OCB-driven go mod tidy fails:

github.com/ProjectASAP/asap-precompute-go: ... replacement directory ... does not exist

This blocks the user's "single sketchcollector binary including all sketches plugins" workflow today.

What this PR does (two-file change)

1. opentelemetry-collector-contrib-patch/cmd/sketchcollector/builder-config.yaml — add a replaces: entry that redirects github.com/ProjectASAP/asap-precompute-go to the in-repo checkout. Mirrors the existing sketchlib-go pattern. Path note: asap-precompute-go lives as a subdirectory of this repo (ASAPCollector/asap-precompute-go), unlike sketchlib-go which is a sibling repo, so the relative path is ../../../asap-precompute-go (one fewer .. than the sketchlib-go entry).

2. build_sketchcollector.sh — defensively append the same replace to the OCB-generated go.mod if it isn't already present, mirroring the existing sketchlib-go grep+append guard. This handles the case where OCB strips replaces during go.mod regeneration.

The intent of one binary including all five sketch plugins (per builder-config.yaml lines 147-156) is preserved — this PR just makes the OCB-generated go.mod resolve asap-precompute-go to the local checkout instead of failing on a missing module-proxy lookup.

Verification

• Ran ./build_sketchcollector.sh with these two file changes against current origin/main (which has all five Phase-2 shim PRs merged): build succeeds end-to-end. OCB tidy resolves the replace directive, compiles, and emits cmd/sketchcollector/sketchcollector (~470 MB binary).
• Inspected the OCB-generated cmd/sketchcollector/go.mod after the build — both private-module replaces are wired correctly:

  replace github.com/ProjectASAP/sketchlib-go => ../../../../sketchlib-go
  replace github.com/ProjectASAP/asap-precompute-go => ../../../asap-precompute-go
  

• Without the fix, the same script fails with replacement directory ... does not exist on asap-precompute-go during go mod tidy.

Test plan

• ./build_sketchcollector.sh produces a working sketchcollector binary on origin/main with the five Phase-2 shim PRs merged.
• No submodule pointer drift committed.
• No structural refactor of the build script — only the two-line defensive grep+append guard added.

Out of scope

Independent of and parallel to PR phase2/snapshot-cache-correctness-and-common-wrappers.

Authoring note

This PR was authored by an automated agent (Claude Code).

View Claude Code session