[exporter/splunkhecexporter] Add OtelAttrsToHec struct and related config fields (open-telemetry#35476)

**Description:** Adding a new config fields
`otel_attrs_to_hec_metadata/*` to replace the
`hec_metadata_to_otel_attrs/*` config fields.

**Link to tracking Issue:** fixes open-telemetry#35092

**Testing:** No new tests added, modified existing tests.

**Documentation:** Adding field-level description to exporter README.md.

Author: bderrly

.chloggen/iss-35092.yaml

@@ -0,0 +1,28 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: deprecation
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: splunkhecexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `otel_attrs_to_hec_metadata/*` config fields to replace `hec_metadata_to_otel_attrs/*` fields.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35092]
+
+# (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: |
+  `otel_attrs_to_hec_metadata/*` config fields will replace the `hec_metadata_to_otel_attrs/*` fields in a later release.
+
+# 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]

exporter/splunkhecexporter/README.md

@@ -54,10 +54,18 @@ The following configuration options can also be configured:
 - `health_path` (default = '/services/collector/health'): The path reporting [health checks](https://docs.splunk.com/Documentation/Splunk/9.0.1/RESTREF/RESTinput#services.2Fcollector.2Fhealth).
 - `health_check_enabled` (default = false): Whether to perform Splunk HEC Health Check during the exporter's startup.
 - `export_raw` (default = false): send only the log's body, targeting a Splunk HEC raw endpoint.
+- `otel_attrs_to_hec_metadata/source` (default = 'com.splunk.source'): Specifies the mapping of a specific unified model attribute value to the standard source field of a HEC event.
+- `otel_attrs_to_hec_metadata/sourcetype` (default = 'com.splunk.sourcetype'): Specifies the mapping of a specific unified model attribute value to the standard sourcetype field of a HEC event.
+- `otel_attrs_to_hec_metadata/index` (default = 'com.splunk.index'):  Specifies the mapping of a specific unified model attribute value to the standard index field of a HEC event.
+- `otel_attrs_to_hec_metadata/host` (default = 'host.name'):  Specifies the mapping of a specific unified model attribute value to the standard host field and the `host.name` field of a HEC event.
 - `hec_metadata_to_otel_attrs/source` (default = 'com.splunk.source'): Specifies the mapping of a specific unified model attribute value to the standard source field of a HEC event.
+  **Deprecated** (v0.116.0): prefer `otel_attrs_to_hec_metadata/source`.
 - `hec_metadata_to_otel_attrs/sourcetype` (default = 'com.splunk.sourcetype'): Specifies the mapping of a specific unified model attribute value to the standard sourcetype field of a HEC event.
+  **Deprecated** (v0.116.0): prefer `otel_attrs_to_hec_metadata/sourcetype`.
 - `hec_metadata_to_otel_attrs/index` (default = 'com.splunk.index'):  Specifies the mapping of a specific unified model attribute value to the standard index field of a HEC event.
+  **Deprecated** (v0.116.0): prefer `otel_attrs_to_hec_metadata/index`.
 - `hec_metadata_to_otel_attrs/host` (default = 'host.name'):  Specifies the mapping of a specific unified model attribute value to the standard host field and the `host.name` field of a HEC event.
+  **Deprecated** (v0.116.0): prefer `otel_attrs_to_hec_metadata/host`.
 - `otel_to_hec_fields/severity_text` (default = `otel.log.severity.text`): Specifies the name of the field to map the severity text field of log events.
 - `otel_to_hec_fields/severity_number` (default = `otel.log.severity.number`): Specifies the name of the field to map the severity number field of log events.
 - `otel_to_hec_fields/name` (default = `"otel.log.name`): Specifies the name of the field to map the name field of log events.

exporter/splunkhecexporter/config.go

@@ -116,7 +116,12 @@ type Config struct {
 
 	// App version is used to track telemetry information for Splunk App's using HEC by App version. Defaults to the current OpenTelemetry Collector Contrib build version.
 	SplunkAppVersion string `mapstructure:"splunk_app_version"`
+
+	// OtelAttrsToHec creates a mapping from attributes to HEC specific metadata: source, sourcetype, index and host.
+	OtelAttrsToHec splunk.HecToOtelAttrs `mapstructure:"otel_attrs_to_hec_metadata"`
+
 	// HecToOtelAttrs creates a mapping from attributes to HEC specific metadata: source, sourcetype, index and host.
+	// Deprecated: [v0.113.0] Use OtelAttrsToHec instead.
 	HecToOtelAttrs splunk.HecToOtelAttrs `mapstructure:"hec_metadata_to_otel_attrs"`
 	// HecFields creates a mapping from attributes to HEC fields.
 	HecFields OtelToHecFields `mapstructure:"otel_to_hec_fields"`

exporter/splunkhecexporter/config_test.go

@@ -102,6 +102,12 @@ func TestLoadConfig(t *testing.T) {
 						MaxSizeItems: 10,
 					},
 				},
+				OtelAttrsToHec: splunk.HecToOtelAttrs{
+					Source:     "mysource",
+					SourceType: "mysourcetype",
+					Index:      "myindex",
+					Host:       "myhost",
+				},
 				HecToOtelAttrs: splunk.HecToOtelAttrs{
 					Source:     "mysource",
 					SourceType: "mysourcetype",

exporter/splunkhecexporter/factory.go

@@ -86,6 +86,12 @@ func createDefaultConfig() component.Config {
 		MaxContentLengthMetrics: defaultContentLengthMetricsLimit,
 		MaxContentLengthTraces:  defaultContentLengthTracesLimit,
 		MaxEventSize:            defaultMaxEventSize,
+		OtelAttrsToHec: splunk.HecToOtelAttrs{
+			Source:     splunk.DefaultSourceLabel,
+			SourceType: splunk.DefaultSourceTypeLabel,
+			Index:      splunk.DefaultIndexLabel,
+			Host:       conventions.AttributeHostName,
+		},
 		HecToOtelAttrs: splunk.HecToOtelAttrs{
 			Source:     splunk.DefaultSourceLabel,
 			SourceType: splunk.DefaultSourceTypeLabel,

exporter/splunkhecexporter/logdata_to_splunk.go

@@ -23,22 +23,53 @@ const (
 	traceIDFieldKey = "trace_id"
 )
 
+// copyOtelAttrs copies values from HecToOtelAttrs to OtelAttrsToHec struct.
+func copyOtelAttrs(config *Config) {
+	defaultCfg := createDefaultConfig().(*Config)
+	if config.OtelAttrsToHec.Equal(defaultCfg.OtelAttrsToHec) {
+		if !config.HecToOtelAttrs.Equal(defaultCfg.HecToOtelAttrs) {
+			// Copy settings to ease deprecation of HecToOtelAttrs.
+			config.OtelAttrsToHec = config.HecToOtelAttrs
+		}
+	} else {
+		if !config.HecToOtelAttrs.Equal(defaultCfg.HecToOtelAttrs) {
+			// Replace all default fields in OtelAttrsToHec.
+			if config.OtelAttrsToHec.Source == defaultCfg.OtelAttrsToHec.Source {
+				config.OtelAttrsToHec.Source = config.HecToOtelAttrs.Source
+			}
+			if config.OtelAttrsToHec.SourceType == defaultCfg.OtelAttrsToHec.SourceType {
+				config.OtelAttrsToHec.SourceType = config.HecToOtelAttrs.SourceType
+			}
+			if config.OtelAttrsToHec.Index == defaultCfg.OtelAttrsToHec.Index {
+				config.OtelAttrsToHec.Index = config.HecToOtelAttrs.Index
+			}
+			if config.OtelAttrsToHec.Host == defaultCfg.OtelAttrsToHec.Host {
+				config.OtelAttrsToHec.Host = config.HecToOtelAttrs.Host
+			}
+		}
+	}
+}
+
 func mapLogRecordToSplunkEvent(res pcommon.Resource, lr plog.LogRecord, config *Config) *splunk.Event {
 	body := lr.Body().AsRaw()
 	if body == nil || body == "" {
 		// events with no body are rejected by Splunk.
 		return nil
 	}
 
+	// Manage the deprecation of HecToOtelAttrs config parameters.
+	// TODO: remove this once HecToOtelAttrs is removed from Config.
+	copyOtelAttrs(config)
+
 	host := unknownHostName
 	source := config.Source
 	sourcetype := config.SourceType
 	index := config.Index
 	fields := map[string]any{}
-	sourceKey := config.HecToOtelAttrs.Source
-	sourceTypeKey := config.HecToOtelAttrs.SourceType
-	indexKey := config.HecToOtelAttrs.Index
-	hostKey := config.HecToOtelAttrs.Host
+	sourceKey := config.OtelAttrsToHec.Source
+	sourceTypeKey := config.OtelAttrsToHec.SourceType
+	indexKey := config.OtelAttrsToHec.Index
+	hostKey := config.OtelAttrsToHec.Host
 	severityTextKey := config.HecFields.SeverityText
 	severityNumberKey := config.HecFields.SeverityNumber
 	if spanID := lr.SpanID(); !spanID.IsEmpty() {

exporter/splunkhecexporter/logdata_to_splunk_test.go

@@ -14,6 +14,100 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/splunk"
 )
 
+func Test_copyOtelAttrs(t *testing.T) {
+	tests := []struct {
+		name             string
+		configDataFn     func() *Config
+		wantConfigDataFn func() *Config
+	}{
+		{
+			name: "defaults",
+			configDataFn: func() *Config {
+				return createDefaultConfig().(*Config)
+			},
+			wantConfigDataFn: func() *Config {
+				return createDefaultConfig().(*Config)
+			},
+		},
+		{
+			name: "override hec_metadata_to_otel_attrs",
+			configDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.HecToOtelAttrs.Index = "testIndex"
+				cfg.HecToOtelAttrs.Source = "testSource"
+				cfg.HecToOtelAttrs.SourceType = "testSourceType"
+				cfg.HecToOtelAttrs.Host = "testHost"
+
+				return cfg
+			},
+			wantConfigDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.HecToOtelAttrs.Index = "testIndex"
+				cfg.HecToOtelAttrs.Source = "testSource"
+				cfg.HecToOtelAttrs.SourceType = "testSourceType"
+				cfg.HecToOtelAttrs.Host = "testHost"
+
+				cfg.OtelAttrsToHec.Index = "testIndex"
+				cfg.OtelAttrsToHec.Source = "testSource"
+				cfg.OtelAttrsToHec.SourceType = "testSourceType"
+				cfg.OtelAttrsToHec.Host = "testHost"
+
+				return cfg
+			},
+		},
+		{
+			name: "partial otel_attrs_to_hec_metadata",
+			configDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.OtelAttrsToHec.Source = "testSource"
+				cfg.OtelAttrsToHec.Index = "testIndex"
+
+				return cfg
+			},
+			wantConfigDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.OtelAttrsToHec.Source = "testSource"
+				cfg.OtelAttrsToHec.Index = "testIndex"
+
+				return cfg
+			},
+		},
+		{
+			name: "prefer otel_attrs_to_hec_metadata",
+			configDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.HecToOtelAttrs.Index = "hecIndex"
+
+				cfg.OtelAttrsToHec.Index = "otelIndex"
+
+				return cfg
+			},
+			wantConfigDataFn: func() *Config {
+				cfg := createDefaultConfig().(*Config)
+
+				cfg.HecToOtelAttrs.Index = "hecIndex"
+
+				cfg.OtelAttrsToHec.Index = "otelIndex"
+
+				return cfg
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := tt.configDataFn()
+			copyOtelAttrs(cfg)
+			assert.Equal(t, tt.wantConfigDataFn(), cfg)
+		})
+	}
+}
+
 func Test_mapLogRecordToSplunkEvent(t *testing.T) {
 	ts := pcommon.Timestamp(123)
 
@@ -153,18 +247,18 @@ func Test_mapLogRecordToSplunkEvent(t *testing.T) {
 			},
 			logResourceFn: pcommon.NewResource,
 			configDataFn: func() *Config {
-				return &Config{
-					HecToOtelAttrs: splunk.HecToOtelAttrs{
-						Source:     "mysource",
-						SourceType: "mysourcetype",
-						Index:      "myindex",
-						Host:       "myhost",
-					},
-					HecFields: OtelToHecFields{
-						SeverityNumber: "myseveritynum",
-						SeverityText:   "myseverity",
-					},
+				config := createDefaultConfig().(*Config)
+				config.HecToOtelAttrs = splunk.HecToOtelAttrs{
+					Source:     "mysource",
+					SourceType: "mysourcetype",
+					Index:      "myindex",
+					Host:       "myhost",
+				}
+				config.HecFields = OtelToHecFields{
+					SeverityNumber: "myseveritynum",
+					SeverityText:   "myseverity",
 				}
+				return config
 			},
 			wantSplunkEvents: []*splunk.Event{
 				func() *splunk.Event {

exporter/splunkhecexporter/testdata/config.yaml

@@ -33,6 +33,11 @@ splunk_hec/allsettings:
     max_size_items: 10
   splunk_app_name: "OpenTelemetry-Collector Splunk Exporter"
   splunk_app_version: "v0.0.1"
+  otel_attrs_to_hec_metadata:
+    source: "mysource"
+    sourcetype: "mysourcetype"
+    index: "myindex"
+    host: "myhost"
   hec_metadata_to_otel_attrs:
     source: "mysource"
     sourcetype: "mysourcetype"

internal/splunk/common.go

@@ -139,6 +139,16 @@ type HecToOtelAttrs struct {
 	Host string `mapstructure:"host"`
 }
 
+func (h HecToOtelAttrs) Equal(o HecToOtelAttrs) bool {
+	if h.Host != o.Host ||
+		h.Source != o.Source ||
+		h.SourceType != o.SourceType ||
+		h.Index != o.Index {
+		return false
+	}
+	return true
+}
+
 type AckRequest struct {
 	Acks []uint64 `json:"acks"`
 }