[#493] logger: Write app version once on start

Writing application version in each log message seems pretty redundant.

Remove global `app_version` field from Node/IR loggers. Write version, build
time and debug flag once on start.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-ir/main.go

@@ -54,10 +54,6 @@ func main() {
 	log, err := logger.NewLogger(logPrm)
 	exitErr(err)
 
-	log = log.With(
-		zap.String("app_version", misc.Version),
-	)
-
 	ctx := grace.NewGracefulContext(log)
 	intErr := make(chan error) // internal inner ring errors
 
@@ -97,7 +93,11 @@ func main() {
 		exitErr(err)
 	}
 
-	log.Info("application started")
+	log.Info("application started",
+		zap.String("build time", misc.Build),
+		zap.String("version", misc.Version),
+		zap.String("debug", misc.Debug),
+	)
 
 	select {
 	case <-ctx.Done():

cmd/neofs-node/config.go

@@ -362,10 +362,6 @@ func initCfg(path string) *cfg {
 	log, err := logger.NewLogger(logPrm)
 	fatalOnErr(err)
 
-	log = log.With(
-		zap.String("app_version", misc.Version),
-	)
-
 	netAddr, err := network.AddressFromString(viperCfg.GetString(cfgBootstrapAddress))
 	fatalOnErr(err)
 

cmd/neofs-node/main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"log"
 
+	"github.com/nspcc-dev/neofs-node/misc"
 	"github.com/nspcc-dev/neofs-node/pkg/services/control"
 	"github.com/nspcc-dev/neofs-node/pkg/util/grace"
 	"go.uber.org/zap"
@@ -68,7 +69,11 @@ func bootUp(c *cfg) {
 }
 
 func wait(c *cfg) {
-	c.log.Info("application started")
+	c.log.Info("application started",
+		zap.String("build time", misc.Build),
+		zap.String("version", misc.Version),
+		zap.String("debug", misc.Debug),
+	)
 
 	select {
 	case <-c.ctx.Done(): // graceful shutdown