fix(logging): default to pretty logging [EE-4371] (#7847)

* fix(logging): default to pretty logging EE-4371

* feat(app/logs): prettify stack traces in JSON logs

* feat(nomad/logs): prettify JSON logs in log viewer

* feat(kubernetes/logs): prettigy JSON logs in log viewers

* feat(app/logs): format and color zerolog prettified logs

* fix(app/logs): pre-parse logs when they are double serialized

Co-authored-by: andres-portainer <andres-portainer@users.noreply.github.com>
Co-authored-by: LP B <xAt0mZ@users.noreply.github.com>

api/cmd/portainer/log.go

@@ -1,7 +1,9 @@
 package main
 
 import (
+	"fmt"
 	stdlog "log"
+	"os"
 
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
@@ -31,3 +33,23 @@ func setLoggingLevel(level string) {
 		zerolog.SetGlobalLevel(zerolog.DebugLevel)
 	}
 }
+
+func setLoggingMode(mode string) {
+	switch mode {
+	case "PRETTY":
+		log.Logger = log.Output(zerolog.ConsoleWriter{
+			Out:           os.Stderr,
+			NoColor:       true,
+			TimeFormat:    "2006/01/02 03:04PM",
+			FormatMessage: formatMessage})
+	case "JSON":
+		log.Logger = log.Output(os.Stderr)
+	}
+}
+
+func formatMessage(i interface{}) string {
+	if i == nil {
+		return ""
+	}
+	return fmt.Sprintf("%s |", i)
+}

api/cmd/portainer/main.go

@@ -758,10 +758,12 @@ func buildServer(flags *portainer.CLIFlags) portainer.Server {
 
 func main() {
 	configureLogger()
+	setLoggingMode("PRETTY")
 
 	flags := initCLI()
 
 	setLoggingLevel(*flags.LogLevel)
+	setLoggingMode(*flags.LogMode)
 
 	for {
 		server := buildServer(flags)