[#740] logs: Add Loki

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

cmd/frostfs-node/config.go

@@ -62,6 +62,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/state"
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/logging/lokicore"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -72,6 +73,7 @@ import (
 	"github.com/panjf2000/ants/v2"
 	"go.etcd.io/bbolt"
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 	"google.golang.org/grpc"
 )
 
@@ -577,6 +579,12 @@ func initCfg(appCfg *config.Config) *cfg {
 	logPrm.SamplingHook = c.metricsCollector.LogMetrics().GetSamplingHook()
 	log, err := logger.NewLogger(logPrm)
 	fatalOnErr(err)
+	if loggerconfig.ToLokiConfig(appCfg).Enabled {
+		log.Logger = log.Logger.WithOptions(zap.WrapCore(func(core zapcore.Core) zapcore.Core {
+			lokiCore := lokicore.New(core, loggerconfig.ToLokiConfig(appCfg))
+			return lokiCore
+		}))
+	}
 
 	c.internals = initInternals(appCfg, log)
 

cmd/frostfs-node/config/logger/config.go

@@ -1,12 +1,21 @@
 package loggerconfig
 
 import (
+	"os"
+	"time"
+
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/logging/lokicore/loki"
 )
 
 const (
 	// LevelDefault is a default logger level.
-	LevelDefault = "info"
+	LevelDefault              = "info"
+	subsection                = "logger"
+	lokiSubsection            = "loki"
+	AddressDefault            = "localhost:3100"
+	BatchEntriesNumberDefault = 100
+	BatchWaitDefault          = time.Second
 )
 
 // Level returns the value of "level" config parameter
@@ -15,7 +24,7 @@ const (
 // Returns LevelDefault if the value is not a non-empty string.
 func Level(c *config.Config) string {
 	v := config.StringSafe(
-		c.Sub("logger"),
+		c.Sub(subsection),
 		"level",
 	)
 	if v != "" {
@@ -24,3 +33,44 @@ func Level(c *config.Config) string {
 
 	return LevelDefault
 }
+
+// ToLokiConfig extracts loki config.
+func ToLokiConfig(c *config.Config) loki.Config {
+	hostname, _ := os.Hostname()
+	return loki.Config{
+		Enabled:            config.BoolSafe(c.Sub(subsection).Sub(lokiSubsection), "enabled"),
+		BatchWait:          getBatchWait(c),
+		BatchEntriesNumber: getBatchEntriesNumber(c),
+		Endpoint:           getEndpoint(c),
+		Labels: map[string]string{
+			"hostname": hostname,
+		},
+	}
+}
+
+func getBatchWait(c *config.Config) time.Duration {
+	v := config.DurationSafe(c.Sub(subsection).Sub(lokiSubsection), "max_batch_delay")
+	if v > 0 {
+		return v
+	}
+
+	return BatchWaitDefault
+}
+
+func getBatchEntriesNumber(c *config.Config) int {
+	v := config.IntSafe(c.Sub(subsection).Sub(lokiSubsection), "max_batch_size")
+	if v > 0 {
+		return int(v)
+	}
+
+	return BatchEntriesNumberDefault
+}
+
+func getEndpoint(c *config.Config) string {
+	v := config.StringSafe(c.Sub(subsection).Sub(lokiSubsection), "endpoint")
+	if v != "" {
+		return v
+	}
+
+	return AddressDefault
+}

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20231031104748-498877e378fd
 	git.frostfs.info/TrueCloudLab/frostfs-contract v0.18.1-0.20231102065436-9ed3845aa989
-	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6
+	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20231101111734-b3ad3335ff65
 	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20231101144515-6fbe1595cb3d
 	git.frostfs.info/TrueCloudLab/hrw v1.2.1
 	git.frostfs.info/TrueCloudLab/policy-engine v0.0.0-20231101082425-5eee1a733432