Fix capacity for immediate appends (#10528)

Fixes #10504

Author: shohamc1

cmd/snapshots/manifest/manifest.go

@@ -12,12 +12,13 @@ import (
 	"strings"
 	"time"
 
+	"github.com/urfave/cli/v2"
+
 	"github.com/ledgerwatch/erigon-lib/downloader"
 	"github.com/ledgerwatch/erigon-lib/downloader/snaptype"
 	"github.com/ledgerwatch/erigon/cmd/snapshots/sync"
 	"github.com/ledgerwatch/erigon/cmd/utils"
 	"github.com/ledgerwatch/erigon/turbo/logging"
-	"github.com/urfave/cli/v2"
 )
 
 var (
@@ -286,7 +287,7 @@ func verifyManifest(ctx context.Context, srcSession *downloader.RCloneSession, v
 	var extra string
 
 	if len(manifestFiles) != 0 {
-		files := make([]string, len(manifestFiles))
+		files := make([]string, 0, len(manifestFiles))
 
 		for file := range manifestFiles {
 			files = append(files, file)
@@ -296,7 +297,7 @@ func verifyManifest(ctx context.Context, srcSession *downloader.RCloneSession, v
 	}
 
 	if len(dirFiles) != 0 {
-		files := make([]string, len(dirFiles))
+		files := make([]string, 0, len(dirFiles))
 
 		for file := range dirFiles {
 			files = append(files, file)

core/blockchain.go

@@ -233,7 +233,7 @@ func logReceipts(receipts types.Receipts, txns types.Transactions, cc *chain.Con
 		return
 	}
 
-	marshalled := make([]map[string]interface{}, len(receipts))
+	marshalled := make([]map[string]interface{}, 0, len(receipts))
 	for i, receipt := range receipts {
 		txn := txns[i]
 		marshalled = append(marshalled, ethutils.MarshalReceipt(receipt, txn, cc, header, txn.Hash(), true))

diagnostics/logs.go

@@ -70,7 +70,7 @@ func writeLogsList(w http.ResponseWriter, dirPath string) {
 		Size int64  `json:"size"`
 	}
 
-	files := make([]file, len(infos))
+	files := make([]file, 0, len(infos))
 
 	for _, fileInfo := range infos {
 		files = append(files, file{Name: fileInfo.Name(), Size: fileInfo.Size()})