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This is documentation for the next version of Alloy. For the latest stable release, go to the latest version.

Open source

Experimental

otelcol.exporter.debug

otelcol.exporter.debug accepts telemetry data from other otelcol components and writes them to the console (stderr). You can control the verbosity of the logs.

Note

otelcol.exporter.debug is a wrapper over the upstream OpenTelemetry Collector debug exporter. If necessary, bug reports or feature requests are redirected to the upstream repository.

You can specify multiple otelcol.exporter.debug components by giving them different labels.

Usage

river
otelcol.exporter.debug "LABEL" { }

Arguments

otelcol.exporter.debug supports the following arguments:

NameTypeDescriptionDefaultRequired
verbositystringVerbosity of the generated logs."basic"no
sampling_initialintNumber of messages initially logged each second.2no
sampling_thereafterintSampling rate after the initial messages are logged.1no
use_internal_loggerboolWhether to use the internal logger or print directly to stdout.trueno

The verbosity argument must be one of:

  • "basic": A single-line summary of received data is logged to stderr, with a total count of telemetry records for every batch of received logs, metrics, or traces.
  • "normal": Produces the same output as "basic" verbosity.
  • "detailed": All details of every telemetry record are logged to stderr, typically writing multiple lines for every telemetry record.

The following example shows "basic" and "normal" output:

ts=2024-06-13T11:24:13.782957Z level=info msg=TracesExporter component_path=/ component_id=otelcol.exporter.debug.default "resource spans": 1, spans: 2

The following example shows "detailed" output:

ts=2024-06-13T11:24:13.782957Z level=info msg=TracesExporter component_path=/ component_id=otelcol.exporter.debug.default "resource spans"=1 spans=2
ts=2024-06-13T11:24:13.783101Z level=info msg="ResourceSpans #0
Resource SchemaURL: https://opentelemetry.io/schemas/1.4.0
Resource attributes:
     -> service.name: Str(telemetrygen)
ScopeSpans #0
ScopeSpans SchemaURL:
InstrumentationScope telemetrygen
Span #0
    Trace ID       : 3bde5d3ee82303571bba6e1136781fe4
    Parent ID      : 5e9dcf9bac4acc1f
    ID             : 2cf3ef2899aba35c
    Name           : okey-dokey
    Kind           : Server
    Start time     : 2023-11-11 04:49:03.509369393 +0000 UTC
    End time       : 2023-11-11 04:49:03.50949377 +0000 UTC
    Status code    : Unset
    Status message :
Attributes:
     -> net.peer.ip: Str(1.2.3.4)
     -> peer.service: Str(telemetrygen-client)
Span #1
    Trace ID       : 3bde5d3ee82303571bba6e1136781fe4
    Parent ID      :
    ID             : 5e9dcf9bac4acc1f
    Name           : lets-go
    Kind           : Client
    Start time     : 2023-11-11 04:49:03.50935117 +0000 UTC
    End time       : 2023-11-11 04:49:03.50949377 +0000 UTC
    Status code    : Unset
    Status message :
Attributes:
     -> net.peer.ip: Str(1.2.3.4)
     -> peer.service: Str(telemetrygen-server)
        {"kind": "exporter", "data_type": "traces", "name": "debug"}"

Note

All instances of \n in the "detailed" example have been replaced with new lines.

Setting use_internal_logger to false is useful if you would like to see actual new lines instead of \n in the collector logs. However, by not using the internal logger you wouldn’t see metadata in the log line such as component_id=otelcol.exporter.debug.default. Multiline logs may also be harder to parse.

Blocks

The following blocks are supported inside the definition of otelcol.exporter.debug:

HierarchyBlockDescriptionRequired
debug_metricsdebug_metricsConfigures the metrics that this component generates to monitor its state.no

The > symbol indicates deeper levels of nesting. For example, client > tls refers to a tls block defined inside a client block.

debug_metrics block

The debug_metrics block configures the metrics that this component generates to monitor its state.

The following arguments are supported:

NameTypeDescriptionDefaultRequired
disable_high_cardinality_metricsbooleanWhether to disable certain high cardinality metrics.trueno
levelstringControls the level of detail for metrics emitted by the wrapped collector."detailed"no

disable_high_cardinality_metrics is the Grafana Alloy equivalent to the telemetry.disableHighCardinalityMetrics feature gate in the OpenTelemetry Collector. It removes attributes that could cause high cardinality metrics. For example, attributes with IP addresses and port numbers in metrics about HTTP and gRPC connections are removed.

Note

If configured, disable_high_cardinality_metrics only applies to otelcol.exporter.* and otelcol.receiver.* components.

level is the Alloy equivalent to the telemetry.metrics.level feature gate in the OpenTelemetry Collector. Possible values are "none", "basic", "normal" and "detailed".

Exported fields

The following fields are exported and can be referenced by other components:

NameTypeDescription
inputotelcol.ConsumerA value that other components can use to send telemetry data to.

input accepts otelcol.Consumer data for any telemetry signal (metrics, logs, or traces).

Component health

otelcol.exporter.debug is only reported as unhealthy if given an invalid configuration.

Debug information

otelcol.exporter.debug does not expose any component-specific debug information.

Example

This example receives OTLP metrics, logs, and traces and writes them to the console:

alloy
otelcol.receiver.otlp "default" {
    grpc {}
    http {}

    output {
        metrics = [otelcol.exporter.debug.default.input]
        logs    = [otelcol.exporter.debug.default.input]
        traces  = [otelcol.exporter.debug.default.input]
    }
}

otelcol.exporter.debug "default" {}

Compatible components

otelcol.exporter.debug has exports that can be consumed by the following components:

Note

Connecting some components may not be sensible or components may require further configuration to make the connection work correctly. Refer to the linked documentation for more details.