Update PR #2097 description

Author: okankoAMZ

pull/2097

@@ -0,0 +1,33 @@
+## Description of the issue
+
+The Makefile builds all architectures sequentially within each platform target. On a multi-core machine, make amazon-cloudwatch-agent-linux took ~75s because amd64 and arm64 binaries were compiled one after the other.
+
+## Description of changes
+
+Split build targets by architecture so amd64 and arm64 compile in parallel, and enable automatic parallelization via MAKEFLAGS:
+
+- Add NPROCS/MAKEFLAGS += -j$(NPROCS) for automatic parallelization based on available CPU cores
+- Split amazon-cloudwatch-agent-linux into linux-amd64 + linux-arm64 sub-targets
+- Split amazon-cloudwatch-agent-darwin into darwin-amd64 + darwin-arm64 sub-targets
+- Add explicit build dependencies to package-prepare-* targets to prevent race conditions when running make release with -j
+- Exclude build-profile* directories from check_secrets to prevent false positives
+
+## Tests
+
+Local benchmarks (32-core machine):
+
+| Target | Before | After | Speedup |
+|--------|--------|-------|---------|
+| `amazon-cloudwatch-agent-linux` | 74.93s | 6.22s | 12x |
+| `make build` (all platforms) | ~90s | 6.44s | ~14x |
+
+CI benchmarks (non-cached, vs run #1679 (https://github.com/aws/amazon-cloudwatch-agent/actions/runs/24719951360)):
+
+| Job | Before | After | Speedup |
+|-----|--------|-------|---------|
+| BuildAndUpload / MakeBinary | 13m 45s | 3m 47s | 3.6x |
+| BuildAndUploadCN / MakeBinary | 15m 9s | 4m 9s | 3.6x |
+| BuildAndUploadITAR / MakeBinary | 13m 55s | 5m 23s | 2.6x |
+| MakeMacPkg | 11m 27s | 3m 38s | 3.2x |
+
+All existing top-level targets (make build, make release, make amazon-cloudwatch-agent-linux, etc.) are preserved — backwards compatible.