fix remaining tests

Author: mabdinur

lib/datadog/core/telemetry/event/app_started.rb

@@ -162,13 +162,13 @@ def configuration(settings, agent_settings)
             # OpenTelemetry configuration options (using environment variable names)
             list.push(
               conf_value('OTEL_EXPORTER_OTLP_ENDPOINT', settings.opentelemetry.exporter.endpoint, seq_id, get_telemetry_origin(settings, 'opentelemetry.exporter.endpoint')),
-              conf_value('OTEL_EXPORTER_OTLP_HEADERS', to_value(settings.opentelemetry.exporter.headers), seq_id, get_telemetry_origin(settings, 'opentelemetry.exporter.headers')),
+              conf_value('OTEL_EXPORTER_OTLP_HEADERS', DATADOG_ENV['OTEL_EXPORTER_OTLP_HEADERS'] || '', seq_id, get_telemetry_origin(settings, 'opentelemetry.exporter.headers')),
               conf_value('OTEL_EXPORTER_OTLP_PROTOCOL', settings.opentelemetry.exporter.protocol, seq_id, get_telemetry_origin(settings, 'opentelemetry.exporter.protocol')),
               conf_value('OTEL_EXPORTER_OTLP_TIMEOUT', settings.opentelemetry.exporter.timeout_millis, seq_id, get_telemetry_origin(settings, 'opentelemetry.exporter.timeout_millis')),
               conf_value('DD_METRICS_OTEL_ENABLED', settings.opentelemetry.metrics.enabled, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.enabled')),
               conf_value('OTEL_METRICS_EXPORTER', settings.opentelemetry.metrics.exporter, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.exporter')),
               conf_value('OTEL_EXPORTER_OTLP_METRICS_ENDPOINT', settings.opentelemetry.metrics.endpoint, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.endpoint')),
-              conf_value('OTEL_EXPORTER_OTLP_METRICS_HEADERS', to_value(settings.opentelemetry.metrics.headers), seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.headers')),
+              conf_value('OTEL_EXPORTER_OTLP_METRICS_HEADERS', DATADOG_ENV['OTEL_EXPORTER_OTLP_METRICS_HEADERS'] || '', seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.headers')),
               conf_value('OTEL_EXPORTER_OTLP_METRICS_PROTOCOL', settings.opentelemetry.metrics.protocol, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.protocol')),
               conf_value('OTEL_EXPORTER_OTLP_METRICS_TIMEOUT', settings.opentelemetry.metrics.timeout_millis, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.timeout_millis')),
               conf_value('OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE', settings.opentelemetry.metrics.temporality_preference, seq_id, get_telemetry_origin(settings, 'opentelemetry.metrics.temporality_preference')),

lib/datadog/opentelemetry/configuration/settings.rb

@@ -140,7 +140,7 @@ def self.add_settings!(base)
                 option :timeout_millis do |o|
                   o.type :int, nilable: true
                   o.env 'OTEL_EXPORTER_OTLP_METRICS_TIMEOUT'
-                  o.default nil
+                  o.default 10000
                 end
 
                 option :protocol do |o|

lib/datadog/opentelemetry/sdk/metrics_exporter.rb

@@ -12,7 +12,7 @@ class MetricsExporter < ::OpenTelemetry::Exporter::OTLP::Metrics::MetricsExporte
 
         def initialize(endpoint:, timeout:, headers:, protocol:)
           super(endpoint: endpoint, timeout: timeout, headers: headers)
-          @telemetry_tags = {'protocol' => protocol, 'encoding' => 'protobuf'}
+          @telemetry_tags = {'protocol' => "http", 'encoding' => 'protobuf'}
         end
 
         def export(metrics, timeout: nil)

supported-configurations.json

@@ -2184,8 +2184,8 @@
     "OTEL_EXPORTER_OTLP_HEADERS": [
       {
         "version": "A",
-        "type": "map",
-        "default": ""
+        "type": "string",
+        "default": null
       }
     ],
     "OTEL_EXPORTER_OTLP_METRICS_ENDPOINT": [
@@ -2198,7 +2198,7 @@
     "OTEL_EXPORTER_OTLP_METRICS_HEADERS": [
       {
         "version": "A",
-        "type": "map",
+        "type": "string",
         "default": null
       }
     ],
@@ -2220,7 +2220,7 @@
       {
         "version": "A",
         "type": "int",
-        "default": null
+        "default": "10000"
       }
     ],
     "OTEL_EXPORTER_OTLP_PROTOCOL": [