Fix alignment of atomic int64 (#11547)

* Fix atomix int64 placement
* Test main for 386

Signed-off-by: Julien Pivotto <roidelapluie@o11y.eu>

.github/workflows/ci.yml

@@ -16,6 +16,7 @@ jobs:
       - uses: ./.github/actions/setup_environment
       - run: make GO_ONLY=1 SKIP_GOLANGCI_LINT=1
       - run: go test ./tsdb/ -test.tsdb-isolation=false
+      - run: GOARCH=386 go test ./cmd/prometheus
       - run: make -C documentation/examples/remote_storage
       - run: make -C documentation/examples
       - uses: ./.github/actions/check_proto

tsdb/head.go

@@ -132,6 +132,9 @@ type HeadOptions struct {
 	// https://pkg.go.dev/sync/atomic#pkg-note-BUG
 	MaxExemplars atomic.Int64
 
+	OutOfOrderTimeWindow atomic.Int64
+	OutOfOrderCapMax     atomic.Int64
+
 	// EnableNativeHistograms enables the ingestion of native histograms.
 	EnableNativeHistograms atomic.Bool
 
@@ -141,8 +144,6 @@ type HeadOptions struct {
 	ChunkPool            chunkenc.Pool
 	ChunkWriteBufferSize int
 	ChunkWriteQueueSize  int
-	OutOfOrderTimeWindow atomic.Int64
-	OutOfOrderCapMax     atomic.Int64
 
 	// StripeSize sets the number of entries in the hash map, it must be a power of 2.
 	// A larger StripeSize will allocate more memory up-front, but will increase performance when handling a large number of series.