From 1b97bf38a2c2ef9a07b37308aa956488f2816256 Mon Sep 17 00:00:00 2001
From: TimotejKovacka <timo.kovacka@gmail.com>
Date: Sun, 29 Sep 2024 13:30:48 +0100
Subject: [PATCH] Allow service.name otel env variable

---
 pkg/opentelemetry/config.go      |  4 ++++
 pkg/opentelemetry/config_test.go | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/pkg/opentelemetry/config.go b/pkg/opentelemetry/config.go
index 2833687..562181b 100644
--- a/pkg/opentelemetry/config.go
+++ b/pkg/opentelemetry/config.go
@@ -266,6 +266,10 @@ func parseJSON(data json.RawMessage) (Config, error) {
 func parseEnvs(env map[string]string) (Config, error) {
 	cfg := Config{}
 
+	if serviceName, ok := env["OTEL_SERVICE_NAME"]; ok {
+		cfg.ServiceName = null.StringFrom(serviceName)
+	}
+
 	err := envconfig.Process("K6_OTEL_", &cfg, func(key string) (string, bool) {
 		v, ok := env[key]
 		return v, ok
diff --git a/pkg/opentelemetry/config_test.go b/pkg/opentelemetry/config_test.go
index d33968b..de996e6 100644
--- a/pkg/opentelemetry/config_test.go
+++ b/pkg/opentelemetry/config_test.go
@@ -89,6 +89,24 @@ func TestConfig(t *testing.T) {
 			},
 		},
 
+		"OTEL environment variables": {
+			env: map[string]string{
+				"OTEL_SERVICE_NAME": "otel-service",
+			},
+			expectedConfig: Config{
+				ServiceName:          null.StringFrom("otel-service"),
+				ServiceVersion:       null.StringFrom(k6Const.Version),
+				ExporterType:         null.StringFrom(grpcExporterType),
+				HTTPExporterInsecure: null.NewBool(false, true),
+				HTTPExporterEndpoint: null.StringFrom("localhost:4318"),
+				HTTPExporterURLPath:  null.StringFrom("/v1/metrics"),
+				GRPCExporterInsecure: null.NewBool(false, true),
+				GRPCExporterEndpoint: null.StringFrom("localhost:4317"),
+				ExportInterval:       types.NullDurationFrom(10 * time.Second),
+				FlushInterval:        types.NullDurationFrom(1 * time.Second),
+			},
+		},
+
 		"JSON complete overwrite": {
 			jsonRaw: json.RawMessage(
 				`{` +