Introduce hashicorp/go-metrics compatibility

README.md

@@ -110,3 +110,29 @@ greatly sacrificing performance.
 In terms of performance, Raft is comparable to Paxos. Assuming stable leadership,
 committing a log entry requires a single round trip to half of the cluster.
 Thus performance is bound by disk I/O and network latency.
+
+
+  ## Metrics Emission and Compatibility
+
+  This library can emit metrics using either `github.com/armon/go-metrics` or `github.com/hashicorp/go-metrics`. Choosing between the libraries is controlled via build tags. 
+
+  **Build Tags**
+  * `armonmetrics` - Using this tag will cause metrics to be routed to `armon/go-metrics`
+  * `hashicorpmetrics` - Using this tag will cause all metrics to be routed to `hashicorp/go-metrics`
+
+  If no build tag is specified, the default behavior is to use `armon/go-metrics`. 
+
+  **Deprecating `armon/go-metrics`**
+
+  Emitting metrics to `armon/go-metrics` is officially deprecated. Usage of `armon/go-metrics` will remain the default until mid-2025 with opt-in support continuing to the end of 2025.
+
+  **Migration**
+  To migrate an application currently using the older `armon/go-metrics` to instead use `hashicorp/go-metrics` the following should be done.
+
+  1. Upgrade libraries using `armon/go-metrics` to consume `hashicorp/go-metrics/compat` instead. This should involve only changing import statements. All repositories in the `hashicorp` namespace
+  2. Update an applications library dependencies to those that have the compatibility layer configured.
+  3. Update the application to use `hashicorp/go-metrics` for configuring metrics export instead of `armon/go-metrics`
+     * Replace all application imports of `github.com/armon/go-metrics` with `github.com/hashicorp/go-metrics`
+     * Instrument your build system to build with the `hashicorpmetrics` tag.
+
+  Eventually once the default behavior changes to use `hashicorp/go-metrics` by default (mid-2025), you can drop the `hashicorpmetrics` build tag.

api.go

@@ -12,8 +12,8 @@ import (
 	"sync/atomic"
 	"time"
 
-	metrics "github.com/armon/go-metrics"
 	hclog "github.com/hashicorp/go-hclog"
+	metrics "github.com/hashicorp/go-metrics/compat"
 )
 
 const (

fsm.go

@@ -8,8 +8,8 @@ import (
 	"io"
 	"time"
 
-	"github.com/armon/go-metrics"
 	hclog "github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/go-metrics/compat"
 )
 
 // FSM is implemented by clients to make use of the replicated log.

go.mod

@@ -5,13 +5,14 @@ go 1.20
 retract v1.1.3 // Deleted original tag; module checksum may not be accurate.
 
 require (
-	github.com/armon/go-metrics v0.4.1
 	github.com/hashicorp/go-hclog v1.6.2
+	github.com/hashicorp/go-metrics v0.5.4-0.20241111182750-ceaacca141e7
 	github.com/hashicorp/go-msgpack/v2 v2.1.2
 	github.com/stretchr/testify v1.8.4
 )
 
 require (
+	github.com/armon/go-metrics v0.4.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/hashicorp/go-immutable-radix v1.0.0 // indirect

go.sum

@@ -1,8 +1,10 @@
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+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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@@ -120,5 +174,6 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/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=

log.go

@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"time"
 
-	metrics "github.com/armon/go-metrics"
+	metrics "github.com/hashicorp/go-metrics/compat"
 )
 
 // LogType describes various types of log entries.

log_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	metrics "github.com/armon/go-metrics"
+	metrics "github.com/hashicorp/go-metrics/compat"
 )
 
 func TestOldestLog(t *testing.T) {

net_transport.go

@@ -14,8 +14,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/armon/go-metrics"
 	"github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/go-metrics/compat"
 	"github.com/hashicorp/go-msgpack/v2/codec"
 )
 

raft.go

@@ -14,7 +14,7 @@ import (
 
 	"github.com/hashicorp/go-hclog"
 
-	"github.com/armon/go-metrics"
+	"github.com/hashicorp/go-metrics/compat"
 )
 
 const (

replication.go

@@ -10,7 +10,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/armon/go-metrics"
+	"github.com/hashicorp/go-metrics/compat"
 )
 
 const (

saturation.go

@@ -7,7 +7,7 @@ import (
 	"math"
 	"time"
 
-	"github.com/armon/go-metrics"
+	"github.com/hashicorp/go-metrics/compat"
 )
 
 // saturationMetric measures the saturation (percentage of time spent working vs

snapshot.go

@@ -8,7 +8,7 @@ import (
 	"io"
 	"time"
 
-	"github.com/armon/go-metrics"
+	"github.com/hashicorp/go-metrics/compat"
 )
 
 // SnapshotMeta is for metadata of a snapshot.