[connector/signaltometrics] Add boilerplate for the connector

.chloggen/add-signaltometrics-connector.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: new_component
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: signaltometricsconnector
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: New component for generating metrics from raw signals using user defined OTTL expressions.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35930]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

.github/CODEOWNERS

@@ -34,6 +34,7 @@ connector/otlpjsonconnector/                      @open-telemetry/collector-cont
 connector/roundrobinconnector/                    @open-telemetry/collector-contrib-approvers @bogdandrutu
 connector/routingconnector/                       @open-telemetry/collector-contrib-approvers @jpkrohling @mwear
 connector/servicegraphconnector/                  @open-telemetry/collector-contrib-approvers @jpkrohling @mapno @JaredTan95
+connector/signaltometricsconnector/               @open-telemetry/collector-contrib-approvers @ChrsMark @lahsivjar
 connector/spanmetricsconnector/                   @open-telemetry/collector-contrib-approvers @portertech @Frapschen
 connector/sumconnector/                           @open-telemetry/collector-contrib-approvers @greatestusername @shalper2 @crobert-1
 

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -35,6 +35,7 @@ body:
       - connector/roundrobin
       - connector/routing
       - connector/servicegraph
+      - connector/signaltometrics
       - connector/spanmetrics
       - connector/sum
       - examples/demo

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -29,6 +29,7 @@ body:
       - connector/roundrobin
       - connector/routing
       - connector/servicegraph
+      - connector/signaltometrics
       - connector/spanmetrics
       - connector/sum
       - examples/demo

.github/ISSUE_TEMPLATE/other.yaml

@@ -29,6 +29,7 @@ body:
       - connector/roundrobin
       - connector/routing
       - connector/servicegraph
+      - connector/signaltometrics
       - connector/spanmetrics
       - connector/sum
       - examples/demo

.github/ISSUE_TEMPLATE/unmaintained.yaml

@@ -34,6 +34,7 @@ body:
       - connector/roundrobin
       - connector/routing
       - connector/servicegraph
+      - connector/signaltometrics
       - connector/spanmetrics
       - connector/sum
       - examples/demo

connector/signaltometricsconnector/Makefile

@@ -0,0 +1 @@
+include ../../Makefile.Common

connector/signaltometricsconnector/README.md

@@ -0,0 +1,25 @@
+# Signal to metrics connector
+
+Signal to metrics connector produces metrics from all signal types (traces, logs, or metrics).
+
+<!-- status autogenerated section -->
+| Status        |           |
+| ------------- |-----------|
+| Distributions | [] |
+| Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aconnector%2Fsignaltometrics%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aconnector%2Fsignaltometrics) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aconnector%2Fsignaltometrics%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aconnector%2Fsignaltometrics) |
+
+[alpha]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#alpha
+
+## Supported Pipeline Types
+
+| [Exporter Pipeline Type] | [Receiver Pipeline Type] | [Stability Level] |
+| ------------------------ | ------------------------ | ----------------- |
+| traces | metrics | [alpha] |
+| logs | metrics | [alpha] |
+| metrics | metrics | [alpha] |
+
+[Exporter Pipeline Type]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/connector/README.md#exporter-pipeline-type
+[Receiver Pipeline Type]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/connector/README.md#receiver-pipeline-type
+[Stability Level]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#stability-levels
+<!-- end autogenerated section -->
+

connector/signaltometricsconnector/config/config.go

@@ -0,0 +1,7 @@
+package config // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector/config"
+
+type Config struct{}
+
+func (c *Config) Validate() error {
+	return nil
+}

connector/signaltometricsconnector/connector.go

@@ -0,0 +1,47 @@
+package signaltometricsconnector // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/connector"
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/pdata/plog"
+	"go.opentelemetry.io/collector/pdata/pmetric"
+	"go.opentelemetry.io/collector/pdata/ptrace"
+	"go.uber.org/zap"
+)
+
+type signalToMetrics struct {
+	next   consumer.Metrics
+	logger *zap.Logger
+
+	component.StartFunc
+	component.ShutdownFunc
+}
+
+func newSignalToMetrics(
+	set connector.Settings,
+	next consumer.Metrics,
+) *signalToMetrics {
+	return &signalToMetrics{
+		logger: set.Logger,
+		next:   next,
+	}
+}
+
+func (sm *signalToMetrics) Capabilities() consumer.Capabilities {
+	return consumer.Capabilities{MutatesData: false}
+}
+
+func (sm *signalToMetrics) ConsumeTraces(ctx context.Context, td ptrace.Traces) error {
+	return nil
+}
+
+func (sm *signalToMetrics) ConsumeMetrics(ctx context.Context, m pmetric.Metrics) error {
+	return nil
+}
+
+func (sm *signalToMetrics) ConsumeLogs(ctx context.Context, logs plog.Logs) error {
+	return nil
+}

connector/signaltometricsconnector/doc.go

@@ -0,0 +1,4 @@
+//go:generate mdatagen metadata.yaml
+
+// Package signaltometricsconnector provides a stateless connector for generating metrics from raw signals.
+package signaltometricsconnector // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector"

connector/signaltometricsconnector/factory.go

@@ -0,0 +1,54 @@
+package signaltometricsconnector // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/connector"
+	"go.opentelemetry.io/collector/consumer"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector/config"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector/internal/metadata"
+)
+
+// NewFactory returns a ConnectorFactory.
+func NewFactory() connector.Factory {
+	return connector.NewFactory(
+		metadata.Type,
+		createDefaultConfig,
+		connector.WithTracesToMetrics(createTracesToMetrics, metadata.TracesToMetricsStability),
+		connector.WithMetricsToMetrics(createMetricsToMetrics, metadata.MetricsToMetricsStability),
+		connector.WithLogsToMetrics(createLogsToMetrics, metadata.LogsToMetricsStability),
+	)
+}
+
+func createDefaultConfig() component.Config {
+	return &config.Config{}
+}
+
+func createTracesToMetrics(
+	_ context.Context,
+	set connector.Settings,
+	cfg component.Config,
+	nextConsumer consumer.Metrics,
+) (connector.Traces, error) {
+	return newSignalToMetrics(set, nextConsumer), nil
+}
+
+func createMetricsToMetrics(
+	_ context.Context,
+	set connector.Settings,
+	cfg component.Config,
+	nextConsumer consumer.Metrics,
+) (connector.Metrics, error) {
+	return newSignalToMetrics(set, nextConsumer), nil
+}
+
+func createLogsToMetrics(
+	_ context.Context,
+	set connector.Settings,
+	cfg component.Config,
+	nextConsumer consumer.Metrics,
+) (connector.Logs, error) {
+	return newSignalToMetrics(set, nextConsumer), nil
+}

connector/signaltometricsconnector/factory_test.go

@@ -0,0 +1,87 @@
+package signaltometricsconnector
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/connector/connectortest"
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/pdata/pmetric"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/connector/signaltometricsconnector/internal/metadata"
+)
+
+func TestNewFactoryWithLogs(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		f    func(*testing.T)
+	}{
+		{
+			name: "factory_type",
+			f: func(t *testing.T) {
+				factory := NewFactory()
+				require.EqualValues(t, metadata.Type, factory.Type())
+			},
+		},
+		{
+			name: "traces_to_metrics",
+			f: func(t *testing.T) {
+				mc, err := consumer.NewMetrics(func(context.Context, pmetric.Metrics) error {
+					return nil
+				})
+				require.NoError(t, err)
+
+				factory := NewFactory()
+				c, err := factory.CreateTracesToMetrics(
+					context.Background(),
+					connectortest.NewNopSettings(),
+					factory.CreateDefaultConfig(),
+					mc,
+				)
+				require.NoError(t, err)
+				require.NotNil(t, c)
+			},
+		},
+		{
+			name: "logs_to_metrics",
+			f: func(t *testing.T) {
+				mc, err := consumer.NewMetrics(func(context.Context, pmetric.Metrics) error {
+					return nil
+				})
+				require.NoError(t, err)
+
+				factory := NewFactory()
+				c, err := factory.CreateLogsToMetrics(
+					context.Background(),
+					connectortest.NewNopSettings(),
+					factory.CreateDefaultConfig(),
+					mc,
+				)
+				require.NoError(t, err)
+				require.NotNil(t, c)
+			},
+		},
+		{
+			name: "metrics_to_metrics",
+			f: func(t *testing.T) {
+				mc, err := consumer.NewMetrics(func(context.Context, pmetric.Metrics) error {
+					return nil
+				})
+				require.NoError(t, err)
+
+				factory := NewFactory()
+				c, err := factory.CreateMetricsToMetrics(
+					context.Background(),
+					connectortest.NewNopSettings(),
+					factory.CreateDefaultConfig(),
+					mc,
+				)
+				require.NoError(t, err)
+				require.NotNil(t, c)
+			},
+		},
+	} {
+		t.Run(tc.name, tc.f)
+	}
+}