documentation.md

tail_sampling

Internal Telemetry

The following telemetry is emitted by this component.

otelcol_processor_tail_sampling_count_spans_sampled

Count of spans that were sampled or not per sampling policy

Unit	Metric Type	Value Type	Monotonic
{spans}	Sum	Int	true

otelcol_processor_tail_sampling_count_traces_sampled

Count of traces that were sampled or not per sampling policy

Unit	Metric Type	Value Type	Monotonic
{traces}	Sum	Int	true

otelcol_processor_tail_sampling_early_releases_from_cache_decision

Number of spans that were able to be immediately released due to a decision cache hit.

Unit	Metric Type	Value Type	Monotonic
{spans}	Sum	Int	true

otelcol_processor_tail_sampling_global_count_traces_sampled

Global count of traces that were sampled or not by at least one policy

Unit	Metric Type	Value Type	Monotonic
{traces}	Sum	Int	true

otelcol_processor_tail_sampling_new_trace_id_received

Counts the arrival of new traces

Unit	Metric Type	Value Type	Monotonic
{traces}	Sum	Int	true

otelcol_processor_tail_sampling_sampling_decision_latency

Latency (in microseconds) of a given sampling policy

Unit	Metric Type	Value Type
µs	Histogram	Int

otelcol_processor_tail_sampling_sampling_decision_timer_latency

Latency (in microseconds) of each run of the sampling decision timer

Unit	Metric Type	Value Type
µs	Histogram	Int

otelcol_processor_tail_sampling_sampling_late_span_age

Time (in seconds) from the sampling decision was taken and the arrival of a late span

Unit	Metric Type	Value Type
s	Histogram	Int

otelcol_processor_tail_sampling_sampling_policy_evaluation_error

Count of sampling policy evaluation errors

Unit	Metric Type	Value Type	Monotonic
{errors}	Sum	Int	true

otelcol_processor_tail_sampling_sampling_trace_dropped_too_early

Count of traces that needed to be dropped before the configured wait time

Unit	Metric Type	Value Type	Monotonic
{traces}	Sum	Int	true

otelcol_processor_tail_sampling_sampling_trace_removal_age

Time (in seconds) from arrival of a new trace until its removal from memory

Unit	Metric Type	Value Type
s	Histogram	Int

otelcol_processor_tail_sampling_sampling_traces_on_memory

Tracks the number of traces current on memory

Unit	Metric Type	Value Type
{traces}	Gauge	Int