Enable compression in logs WAL (#5408)

CHANGELOG.md

@@ -19,6 +19,10 @@ Main (unreleased)
 
 - Fixed an issue where `loki.process` validation for stage `metric.counter` was 
   allowing invalid combination of configuration options. (@thampiotr)
+
+### Enhancements
+
+- The `loki.write` WAL now has snappy compression enabled by default. (@thepalbi)
 
 v0.37.0 (2023-10-10)
 -----------------

component/common/loki/wal/wal.go

@@ -37,7 +37,7 @@ type wrapper struct {
 func New(cfg Config, log log.Logger, registerer prometheus.Registerer) (WAL, error) {
 	// TODO: We should fine-tune the WAL instantiated here to allow some buffering of written entries, but not written to disk
 	// yet. This will attest for the lack of buffering in the channel Writer exposes.
-	tsdbWAL, err := wlog.NewSize(log, registerer, cfg.Dir, wlog.DefaultSegmentSize, wlog.CompressionNone)
+	tsdbWAL, err := wlog.NewSize(log, registerer, cfg.Dir, wlog.DefaultSegmentSize, wlog.CompressionSnappy)
 	if err != nil {
 		return nil, fmt.Errorf("failde to create tsdb WAL: %w", err)
 	}