Docs » Supported integrations in Splunk Observability Cloud » Instrument back-end applications to send spans to Splunk APM » Instrument .NET applications for Splunk Observability Cloud (OpenTelemetry) » Migrate from the SignalFx .NET Instrumentation

Migrate from the SignalFx .NET Instrumentation πŸ”—

The agent of the Splunk Distribution of OpenTelemetry .NET is an alternative to the SignalFx Instrumentation for .NET. To migrate from the SignalFx instrumentation, follow these instructions.

Compatibility and requirements πŸ”—

For a complete list of requirements, see OpenTelemetry .NET instrumentation compatibility and requirements.

Migrate to the Splunk Distribution of OpenTelemetry .NET πŸ”—

To migrate from the SignalFx Instrumentation for .NET to the Splunk Distribution of OpenTelemetry .NET, follow these steps:

  1. Uninstall the SignalFx Instrumentation for .NET. See Uninstall the SignalFx Instrumentation for .NET.

  2. Install and activate the Splunk Distribution of OpenTelemetry .NET. See Instrument your .NET application.

  3. Specify the endpoint of the OpenTelemetry Collector you’re exporting traces to. See Exporter settings.

  4. Update your settings. See Changes in functionality.

If you manually instrumented your code with OpenTracing, activate OpenTracing support by setting the OTEL_DOTNET_AUTO_OPENTRACING_ENABLED environment variable to true.

Changes in functionality πŸ”—

Each of the following sections describe the main changes in functionality as you migrate from the SignalFx Instrumentation for .NET to the Splunk Distribution of OpenTelemetry .NET.

Configuration setting changes πŸ”—

The following table shows SignalFx Instrumentation for .NET environment variables and their OpenTelemetry equivalents:

SignalFx environment variable

OpenTelemetry environment variable

SIGNALFX_SERVICE_NAME

OTEL_SERVICE_NAME=<service_name>

SIGNALFX_ENV

OTEL_RESOURCE_ATTRIBUTES=deployment.environment=<environment_name>

SIGNALFX_VERSION

OTEL_RESOURCE_ATTRIBUTES=version=<version>

SIGNALFX_GLOBAL_TAGS

OTEL_RESOURCE_ATTRIBUTES

SIGNALFX_TRACE_{<instrumentation>}_ENABLED

OTEL_DOTNET_AUTO_TRACES_DISABLED_INSTRUMENTATIONS

SIGNALFX_RECORDED_VALUE_MAX_LENGTH

OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT

SIGNALFX_DISABLED_INTEGRATIONS

OTEL_DOTNET_AUTO_TRACES_DISABLED_INSTRUMENTATIONS. For a list of supported instrumentations, see Supported libraries.

SIGNALFX_AZURE_APP_SERVICES

Not applicable

SIGNALFX_DOTNET_TRACER_HOME

OTEL_DOTNET_AUTO_HOME. On Linux, set to $HOME/.splunk-otel-dotnet.

SIGNALFX_PROFILER_EXCLUDE_PROCESSES

OTEL_DOTNET_AUTO_EXCLUDE_PROCESSES

SIGNALFX_PROFILER_PROCESSES

Not applicable

SIGNALFX_TRACE_CONFIG_FILE

Not applicable

SIGNALFX_TRACE_ENABLED

Not applicable

SIGNALFX_METRICS_{<metric>}_ENABLED

OTEL_DOTNET_AUTO_METRICS_ENABLED_INSTRUMENTATIONS
OTEL_DOTNET_AUTO_METRICS_DISABLED_INSTRUMENTATIONS

SIGNALFX_ACCESS_TOKEN

SPLUNK_ACCESS_TOKEN

SIGNALFX_REALM

SPLUNK_REALM

SIGNALFX_ENDPOINT_URL

OTEL_EXPORTER_OTLP_ENDPOINT

SIGNALFX_METRICS_ENDPOINT_URL

OTEL_EXPORTER_OTLP_ENDPOINT

SIGNALFX_TRACE_PARTIAL_FLUSH_ENABLED

Not applicable

SIGNALFX_TRACE_PARTIAL_FLUSH_MIN_SPANS

Not applicable

SIGNALFX_TRACE_BUFFER_SIZE

OTEL_BSP_MAX_QUEUE_SIZE. The default value is 2048.

SIGNALFX_PROPAGATORS

OTEL_PROPAGATORS. The default values are tracecontext, baggage. Also available: b3multi, b3.

SIGNALFX_PROFILER_ENABLED

SPLUNK_PROFILER_ENABLED

SIGNALFX_PROFILER_MEMORY_ENABLED

SPLUNK_PROFILER_MEMORY_ENABLED

SIGNALFX_PROFILER_LOGS_ENDPOINT

SPLUNK_PROFILER_LOGS_ENDPOINT

SIGNALFX_PROFILER_CALL_STACK_INTERVAL

SPLUNK_PROFILER_CALL_STACK_INTERVAL

For more information about Splunk OTel .NET settings, see Configure the Splunk Distribution of OpenTelemetry .NET.

Library-specific instrumentation settings πŸ”—

The following table shows library-specific environment variables for the SignalFx Instrumentation for .NET and their OpenTelemetry equivalents:

SignalFx environment variable

OpenTelemetry environment variable

SIGNALFX_HTTP_CLIENT_ERROR_STATUSES

Not applicable

SIGNALFX_HTTP_SERVER_ERROR_STATUSES

Not applicable

SIGNALFX_INSTRUMENTATION_ELASTICSEARCH_TAG_QUERIES

Not applicable

SIGNALFX_INSTRUMENTATION_MONGODB_TAG_COMMANDS

Not configurable using environment variable

SIGNALFX_INSTRUMENTATION_REDIS_TAG_COMMANDS

Not configurable using environment variable.

SIGNALFX_LOGS_INJECTION

Logs are correlated if the Microsoft.Extensions.Logging is used.

SIGNALFX_TRACE_DELAY_WCF_INSTRUMENTATION_ENABLED

Not applicable

SIGNALFX_TRACE_HEADER_TAGS

Not applicable

SIGNALFX_TRACE_HTTP_CLIENT_EXCLUDED_URL_SUBSTRINGS

Not configurable using environment variable.

SIGNALFX_TRACE_KAFKA_CREATE_CONSUMER_SCOPE_ENABLED

Not applicable

SIGNALFX_TRACE_RESPONSE_HEADER_ENABLED

SPLUNK_TRACE_RESPONSE_HEADER_ENABLED

SIGNALFX_TRACE_ROUTE_TEMPLATE_RESOURCE_NAMES_ENABLED

Not applicable. The default behavior is equivalent to setting to previous setting to true.