pt-galera-log-explainer: add --skip-merge, grep -a

--skip-merge can help for cases where merge won't work: node names
intentionally identical
grep -a enables to read logs even though they use binary format

src/go/pt-galera-log-explainer/internal.go

@@ -69,7 +69,7 @@ func timelineFromPaths(paths []string, regexes types.RegexMap) (types.Timeline,
 		// Why it should not just identify using the file path:
 		// so that we are able to merge files that belong to the same nodes
 		// we wouldn't want them to be shown as from different nodes
-		if CLI.PxcOperator {
+		if CLI.PxcOperator || CLI.SkipMerge {
 			timeline[path] = localTimeline
 		} else if CLI.MergeByDirectory {
 			timeline.MergeByDirectory(path, localTimeline)
@@ -129,7 +129,7 @@ func execGrepAndIterate(path, compiledRegex string, stdout chan<- string) error
 		logger.Warn().Msg("On Darwin systems, use 'pt-galera-log-explainer --grep-cmd=ggrep' as it requires grep v3")
 	}
 
-	cmd := exec.Command(CLI.GrepCmd, "-P", compiledRegex, path)
+	cmd := exec.Command(CLI.GrepCmd, "-a", "-P", compiledRegex, path)
 
 	out, err := cmd.StdoutPipe()
 	if err != nil {

src/go/pt-galera-log-explainer/main.go

@@ -35,9 +35,10 @@ var CLI struct {
 	PxcOperator      bool            `default:"false" help:"Analyze logs from Percona PXC operator. Off by default because it negatively impacts performance for non-k8s setups"`
 	ExcludeRegexes   []string        `help:"Remove regexes from analysis. List regexes using 'pt-galera-log-explainer regex-list'"`
 	MergeByDirectory bool            `help:"Instead of relying on identification, merge contexts and columns by base directory. Very useful when dealing with many small logs organized per directories."`
+	SkipMerge        bool            `help:"Disable the ability to merge log files together. Can be used when every nodes have the same wsrep_node_name"`
 
 	List list `cmd:""`
-	//Whois     whois     `cmd:""`
+	//Whois whois `cmd:""`
 	//	Sed       sed       `cmd:""`
 	Ctx       ctx       `cmd:""`
 	RegexList regexList `cmd:""`