Release 3.37.0

CHANGELOG.md

@@ -1,3 +1,26 @@
+## 3.37.0
+### Enhanced
+  - Implemented a new approach to integrating New Relic with SLOG that is more lightweight, out of the way, and collects richer data. These changes have been constructed to be completely backwards-compatible with v1 of nrslog. Changes include:
+     - Wrapping `slog.Handler` objects with errors to allow users to handle invalid use cases
+     - A complete rework of log enrichment so that New Relic linking metadata does not invalidate JSON, BSON, or YAML scanners. This new approach will instead inject the linking metadata as a key-value pair.
+     - Complete support for `With()`, `WithGroup()`, and attributes for automatic instrumentation.
+     - Performance operations.
+     - Robust testing (close to 90% coverage).
+     - **This updates logcontext-v2/nrslog to v1.4.0.**
+  - Now custom application tags (labels) may be added to all forwarded log events.
+     - Enabled if `ConfigAppLogForwardingLabelsEnabled(true)` or `NEW_RELIC_APPLICATION_LOGGING_FORWARDING_LABELS_ENABLED=TRUE`
+     - May exclude labels named in `ConfigAppLogForwardingLabelsExclude("label1","label2",...)` or `NEW_RELIC_APPLICATION_LOGGING_FORWARDING_LABELS_EXCLUDE="label1,label2,..."`
+     - Labels are defined via `ConfigLabels(...)` or `NEW_RELIC_LABELS`
+  - Added memory allocation limit detection/response mechanism to facilitate calling custom functions to perform application-specific resource management functionality, report custom metrics or events, or take other appropriate actions, in response to rising heap memory size.
+
+### Fixed
+  - Added protection around transaction methods to gracefully return when the transaction object is `nil`.
+
+### Support statement
+We use the latest version of the Go language. At minimum, you should be using no version of Go older than what is supported by the Go team themselves.
+See the [Go agent EOL Policy](/docs/apm/agents/go-agent/get-started/go-agent-eol-policy) for details about supported versions of the Go agent and third-party components.
+
+
 ## 3.36.0
 ### Enhanced
   - Internal improvements to securityagent integration to better support trace handling and other support for security analysis of applications under test, now v1.3.4; affects the following other integrations:

README.md

@@ -13,7 +13,7 @@ Go is a compiled language, and doesn’t use a virtual machine. This means that
 
 ### Compatibility and Requirements
 
-For the latest version of the agent, Go 1.18+ is required.
+For the latest version of the agent, Go 1.22+ is required.
 
 Linux, OS X, and Windows (Vista, Server 2008 and later) are supported.
 

v3/examples/oom/main.go

@@ -0,0 +1,56 @@
+// Copyright 2020 New Relic Corporation. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+	"time"
+
+	"github.com/newrelic/go-agent/v3/newrelic"
+)
+
+const MB = 1024 * 1024
+
+func main() {
+	app, err := newrelic.NewApplication(
+		newrelic.ConfigAppName("OOM Response High Water Mark App"),
+		newrelic.ConfigFromEnvironment(),
+		newrelic.ConfigDebugLogger(os.Stdout),
+	)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	// Wait for the application to connect.
+	if err := app.WaitForConnection(5 * time.Second); err != nil {
+		fmt.Println(err)
+	}
+
+	app.HeapHighWaterMarkAlarmSet(1*MB, megabyte)
+	app.HeapHighWaterMarkAlarmSet(10*MB, tenMegabyte)
+	app.HeapHighWaterMarkAlarmSet(100*MB, hundredMegabyte)
+	app.HeapHighWaterMarkAlarmEnable(2 * time.Second)
+
+	var a [][]byte
+	for _ = range 100 {
+		a = append(a, make([]byte, MB, MB))
+		time.Sleep(1 * time.Second)
+	}
+
+	// Shut down the application to flush data to New Relic.
+	app.Shutdown(10 * time.Second)
+}
+
+func megabyte(limit uint64, stats *runtime.MemStats) {
+	fmt.Printf("*** 1M *** threshold %v alloc %v (%v)\n", limit, stats.Alloc, stats.TotalAlloc)
+}
+func tenMegabyte(limit uint64, stats *runtime.MemStats) {
+	fmt.Printf("*** 10M *** threshold %v alloc %v (%v)\n", limit, stats.Alloc, stats.TotalAlloc)
+}
+func hundredMegabyte(limit uint64, stats *runtime.MemStats) {
+	fmt.Printf("*** 100M *** threshold %v alloc %v (%v)\n", limit, stats.Alloc, stats.TotalAlloc)
+}

v3/go.mod

@@ -1,6 +1,6 @@
 module github.com/newrelic/go-agent/v3
 
-go 1.21
+go 1.22
 
 require (
 	google.golang.org/grpc v1.65.0

v3/integrations/logcontext-v2/logWriter/go.mod

@@ -1,9 +1,9 @@
 module github.com/newrelic/go-agent/v3/integrations/logcontext-v2/logWriter
 
-go 1.21
+go 1.22
 
 require (
-	github.com/newrelic/go-agent/v3 v3.36.0
+	github.com/newrelic/go-agent/v3 v3.37.0
 	github.com/newrelic/go-agent/v3/integrations/logcontext-v2/nrwriter v1.0.0
 )
 

v3/integrations/logcontext-v2/nrlogrus/go.mod

@@ -1,9 +1,9 @@
 module github.com/newrelic/go-agent/v3/integrations/logcontext-v2/nrlogrus
 
-go 1.21
+go 1.22
 
 require (
-	github.com/newrelic/go-agent/v3 v3.36.0
+	github.com/newrelic/go-agent/v3 v3.37.0
 	github.com/sirupsen/logrus v1.8.1
 )
 

v3/integrations/logcontext-v2/nrslog/attributes.go

@@ -0,0 +1,97 @@
+package nrslog
+
+import (
+	"log/slog"
+	"maps"
+	"strings"
+)
+
+type attributeCache struct {
+	preCompiledAttributes map[string]interface{}
+	prefix                string
+}
+
+func newAttributeCache() *attributeCache {
+	return &attributeCache{
+		preCompiledAttributes: make(map[string]interface{}),
+		prefix:                "",
+	}
+}
+
+func (c *attributeCache) clone() *attributeCache {
+	return &attributeCache{
+		preCompiledAttributes: maps.Clone(c.preCompiledAttributes),
+		prefix:                c.prefix,
+	}
+}
+
+func (c *attributeCache) copyPreCompiledAttributes() map[string]interface{} {
+	return maps.Clone(c.preCompiledAttributes)
+}
+
+func (c *attributeCache) getPrefix() string {
+	return c.prefix
+}
+
+// precompileGroup sets the group prefix for the cache created by a handler
+// precompileGroup call. This is used to avoid re-computing the group prefix
+// and should only ever be called on newly created caches and handlers.
+func (c *attributeCache) precompileGroup(group string) {
+	if c.prefix != "" {
+		c.prefix += "."
+	}
+	c.prefix += group
+}
+
+// precompileAttributes appends attributes to the cache created by a handler
+// WithAttrs call. This is used to avoid re-computing the with Attrs attributes
+// and should only ever be called on newly created caches and handlers.
+func (c *attributeCache) precompileAttributes(attrs []slog.Attr) {
+	if len(attrs) == 0 {
+		return
+	}
+
+	for _, a := range attrs {
+		c.appendAttr(c.preCompiledAttributes, a, c.prefix)
+	}
+}
+
+func (c *attributeCache) appendAttr(nrAttrs map[string]interface{}, a slog.Attr, groupPrefix string) {
+	// Resolve the Attr's value before doing anything else.
+	a.Value = a.Value.Resolve()
+	// Ignore empty Attrs.
+	if a.Equal(slog.Attr{}) {
+		return
+	}
+
+	// majority of runtime spent allocating and copying strings
+	group := strings.Builder{}
+	group.Grow(len(groupPrefix) + len(a.Key) + 1)
+	group.WriteString(groupPrefix)
+
+	if a.Key != "" {
+		if group.Len() > 0 {
+			group.WriteByte('.')
+		}
+		group.WriteString(a.Key)
+	}
+
+	key := group.String()
+
+	// If the Attr is a group, append its attributes
+	if a.Value.Kind() == slog.KindGroup {
+		attrs := a.Value.Group()
+		// Ignore empty groups.
+		if len(attrs) == 0 {
+			return
+		}
+
+		for _, ga := range attrs {
+			c.appendAttr(nrAttrs, ga, key)
+		}
+		return
+	}
+
+	// attr is an attribute
+	nrAttrs[key] = a.Value.Any()
+}

v3/integrations/logcontext-v2/nrslog/config.go

@@ -0,0 +1,80 @@
+package nrslog
+
+import (
+	"time"
+
+	"github.com/newrelic/go-agent/v3/newrelic"
+)
+
+const updateFrequency = 1 * time.Minute // check infrequently because the go agent config is not expected to change --> cost 50-100 uS
+
+// 44% faster than checking the config on every log message
+type configCache struct {
+	lastCheck time.Time
+
+	// true if we have successfully gotten the config at least once to verify the agent is connected
+	gotStartupConfig bool
+	// true if the logs in context feature is enabled as well as either local decorating or forwarding
+	enabled     bool
+	enrichLogs  bool
+	forwardLogs bool
+}
+
+func newConfigCache() *configCache {
+	return &configCache{}
+}
+
+func (c *configCache) clone() *configCache {
+	return &configCache{
+		lastCheck:        c.lastCheck,
+		gotStartupConfig: c.gotStartupConfig,
+		enabled:          c.enabled,
+		enrichLogs:       c.enrichLogs,
+		forwardLogs:      c.forwardLogs,
+	}
+}
+
+func (c *configCache) shouldEnrichLog(app *newrelic.Application) bool {
+	c.update(app)
+	return c.enrichLogs
+}
+
+func (c *configCache) shouldForwardLogs(app *newrelic.Application) bool {
+	c.update(app)
+	return c.forwardLogs
+}
+
+// isEnabled returns true if the logs in context feature is enabled
+// as well as either local decorating or forwarding.
+func (c *configCache) isEnabled(app *newrelic.Application) bool {
+	c.update(app)
+	return c.enabled
+}
+
+// Note: this has a data race in async use cases, but it does not
+// cause logical errors, only cache misses. This is acceptable in
+// comparison to the cost of synchronization.
+func (c *configCache) update(app *newrelic.Application) {
+	// do not get the config from agent if we have successfully gotten it before
+	// and it has been less than updateFrequency since the last check. This is
+	// because on startup, the agent will return a dummy config until it has
+	// connected and received the real config.
+	if c.gotStartupConfig && time.Since(c.lastCheck) < updateFrequency {
+		return
+	}
+
+	config, ok := app.Config()
+	if !ok {
+		c.enrichLogs = false
+		c.forwardLogs = false
+		c.enabled = false
+		return
+	}
+
+	c.gotStartupConfig = true
+	c.enrichLogs = config.ApplicationLogging.LocalDecorating.Enabled && config.ApplicationLogging.Enabled
+	c.forwardLogs = config.ApplicationLogging.Forwarding.Enabled && config.ApplicationLogging.Enabled
+	c.enabled = config.ApplicationLogging.Enabled && (c.enrichLogs || c.forwardLogs)
+
+	c.lastCheck = time.Now()
+}

v3/integrations/logcontext-v2/nrslog/go.mod

@@ -1,8 +1,8 @@
 module github.com/newrelic/go-agent/v3/integrations/logcontext-v2/nrslog
 
-go 1.21
+go 1.22
 
-require github.com/newrelic/go-agent/v3 v3.36.0
+require github.com/newrelic/go-agent/v3 v3.37.0
 
 
 replace github.com/newrelic/go-agent/v3 => ../../..