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Slog Handler Elastic APM Integration
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Implemented a slog handler that attached trace/correlation logs (if
available) to the log message. Also will report specific log level logs
as errors through an apm tracer.

Add documentation links and clean up comments
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cmenke authored and charliemenke committed Mar 25, 2024
1 parent d6810ab commit 660b1b5
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42 changes: 42 additions & 0 deletions docs/instrumenting.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -776,6 +776,48 @@ func handleRequest(w http.ResponseWriter, req *http.Request) {
}
----

[[builtin-modules-apmslog]]
==== module/apmslog
Package apmslog provides a https://pkg.go.dev/log/slog[slog] Handler
implementation for sending error messages to Elastic APM, as well as automatically
attaching trace context fields to log records while using the context aware
logging methods.

[source,go]
----
import (
"context"
"log/slog"
"go.elastic.co/apm/module/apmslog/v2"
)
func ExampleHandler() {
// Report slog "ERROR" level messages to Elastic APM using
// apm.DefaultTracer() while utilizing some specific slog handler
// to format logging messages
apmHandler = apmslog.NewApmHandler(
apmslog.WithHandler(
slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{
Level: slog.LevelInfo,
}),
),
)
logger = slog.New(apmHandler)
// while using slog context aware methods, any existing trace,
// transaction, or span ID are added from the given context
tx := apm.DefaultTracer().StartTransaction("name", "type")
defer tx.End()
ctx := apm.ContextWithTransaction(context.Background(), tx)
span, ctx := apm.StartSpan(ctx, "name", "type")
defer span.End()
logger.InfoContext(ctx, "I should have a trace, transaction, and span id attached!")
}
----

[[builtin-modules-apmzerolog]]
==== module/apmzerolog
Package apmzerolog provides an implementation of https://github.com/rs/zerolog[Zerolog]'s
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10 changes: 10 additions & 0 deletions docs/supported-tech.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -302,6 +302,16 @@ https://github.com/rs/zerolog/releases/tag/v1.12.0[v1.12.0] and greater.
See <<builtin-modules-apmzerolog, module/apmzerolog>> for more information
about Zerolog integration.

[float]
==== Slog

We support log correlation and exception tracking with
https://pkg.go.dev/log/slog/[Slog],
https://pkg.go.dev/log/[email protected]/[v1.21.0] and greater.

See <<builtin-modules-apmslog, module/apmslog>> for more information
about slog integration.

[float]
[[supported-tech-object-storage]]
=== Object Storage
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74 changes: 74 additions & 0 deletions module/apmslog/example_test.go
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@@ -0,0 +1,74 @@
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package apmslog_test

import (
"context"
"log/slog"
"os"

"go.elastic.co/apm/module/apmslog/v2"
"go.elastic.co/apm/v2"
)

func ExampleHandler() {
// Report slog "ERROR" level messages to Elastic APM using
// apm.DefaultTracer() while utilizing slog.Default().Handler()
// to format logging messages
apmHandler := apmslog.NewApmHandler()
logger := slog.New(apmHandler)

// Report slog "ERROR" level messages to Elastic APM using
// some specific tracer while utilizing slog.Default().Handler()
// to format logging messages
apmHandler = apmslog.NewApmHandler(
apmslog.WithTracer(&apm.Tracer{}),
)
logger = slog.New(apmHandler)

// Report slog "ERROR" and "WARN level messages to Elastic APM using
// apm.DefaultTracer() while utilizing slog.Default().Handler()
// to format logging messages
apmHandler = apmslog.NewApmHandler(
apmslog.WithReportLevel([]slog.Level{slog.LevelError, slog.LevelWarn}),
)
logger = slog.New(apmHandler)

// Report slog "ERROR" level messages to Elastic APM using
// apm.DefaultTracer() while utilizing some specific slog handler
// to format logging messages
apmHandler = apmslog.NewApmHandler(
apmslog.WithHandler(
slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{
Level: slog.LevelInfo,
}),
),
)
logger = slog.New(apmHandler)

// while using slog context aware methods, any existing trace,
// transaction, or span ID are added from the given context
tx := apm.DefaultTracer().StartTransaction("name", "type")
defer tx.End()

ctx := apm.ContextWithTransaction(context.Background(), tx)
span, ctx := apm.StartSpan(ctx, "name", "type")
defer span.End()

logger.InfoContext(ctx, "I should have a trace, transaction, and span id attached!")
}
26 changes: 26 additions & 0 deletions module/apmslog/go.mod
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
module go.elastic.co/apm/module/apmslog/v2

require (
github.com/pkg/errors v0.9.1
github.com/stretchr/testify v1.8.4
go.elastic.co/apm/v2 v2.5.0
)

require (
github.com/armon/go-radix v1.0.0 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/elastic/go-sysinfo v1.7.1 // indirect
github.com/elastic/go-windows v1.0.0 // indirect
github.com/google/go-cmp v0.5.4 // indirect
github.com/joeshaw/multierror v0.0.0-20140124173710-69b34d4ec901 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/prometheus/procfs v0.0.0-20190425082905-87a4384529e0 // indirect
go.elastic.co/fastjson v1.1.0 // indirect
golang.org/x/sys v0.8.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
howett.net/plist v0.0.0-20181124034731-591f970eefbb // indirect
)

replace go.elastic.co/apm/v2 => ../..

go 1.19
63 changes: 63 additions & 0 deletions module/apmslog/go.sum
Original file line number Diff line number Diff line change
@@ -0,0 +1,63 @@
github.com/armon/go-radix v1.0.0 h1:F4z6KzEeeQIMeLFa97iZU6vupzoecKdU5TX24SNppXI=
github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/elastic/go-sysinfo v1.7.1 h1:Wx4DSARcKLllpKT2TnFVdSUJOsybqMYCNQZq1/wO+s0=
github.com/elastic/go-sysinfo v1.7.1/go.mod h1:i1ZYdU10oLNfRzq4vq62BEwD2fH8KaWh6eh0ikPT9F0=
github.com/elastic/go-windows v1.0.0 h1:qLURgZFkkrYyTTkvYpsZIgf83AUsdIHfvlJaqaZ7aSY=
github.com/elastic/go-windows v1.0.0/go.mod h1:TsU0Nrp7/y3+VwE82FoZF8gC/XFg/Elz6CcloAxnPgU=
github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
github.com/joeshaw/multierror v0.0.0-20140124173710-69b34d4ec901 h1:rp+c0RAYOWj8l6qbCUTSiRLG/iKnW3K3/QfPPuSsBt4=
github.com/joeshaw/multierror v0.0.0-20140124173710-69b34d4ec901/go.mod h1:Z86h9688Y0wesXCyonoVr47MasHilkuLMqGhRZ4Hpak=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/procfs v0.0.0-20190425082905-87a4384529e0 h1:c8R11WC8m7KNMkTv/0+Be8vvwo4I3/Ut9AC2FW8fX3U=
github.com/prometheus/procfs v0.0.0-20190425082905-87a4384529e0/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
go.elastic.co/fastjson v1.1.0 h1:3MrGBWWVIxe/xvsbpghtkFoPciPhOCmjsR/HfwEeQR4=
go.elastic.co/fastjson v1.1.0/go.mod h1:boNGISWMjQsUPy/t6yqt2/1Wx4YNPSe+mZjlyw9vKKI=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20191025021431-6c3a3bfe00ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20200509030707-2212a7e161a5/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
howett.net/plist v0.0.0-20181124034731-591f970eefbb h1:jhnBjNi9UFpfpl8YZhA9CrOqpnJdvzuiHsl/dnxl11M=
howett.net/plist v0.0.0-20181124034731-591f970eefbb/go.mod h1:vMygbs4qMhSZSc4lCUl2OEE+rDiIIJAIdR4m7MiMcm0=
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