[processor/tailsampling] Move from OpenCensus to OTel API

.chloggen/jpkroehling_migrate-metrics-for-tailsampling.yaml

@@ -0,0 +1,15 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'enhancement'
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: processor/tailsampling
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Migrates internal telemetry to OpenTelemetry SDK via mdatagen
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31581]
+
+subtext: The metric names and their properties, such as bucket boundaries for histograms, were kept like before, to keep backwards compatibility.

processor/tailsamplingprocessor/documentation.md

@@ -0,0 +1,95 @@
+[comment]: <> (Code generated by mdatagen. DO NOT EDIT.)
+
+# tail_sampling
+
+## Internal Telemetry
+
+The following telemetry is emitted by this component.
+
+### 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 |
+
+### 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 |
+
+### 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 |
+
+### processor_tail_sampling_new_trace_id_received
+
+Counts the arrival of new traces
+
+| Unit | Metric Type | Value Type | Monotonic |
+| ---- | ----------- | ---------- | --------- |
+| {traces} | Sum | Int | true |
+
+### processor_tail_sampling_sampling_decision_latency
+
+Latency (in microseconds) of a given sampling policy
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| µs | Histogram | Int |
+
+### 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 |
+
+### 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 |
+
+### processor_tail_sampling_sampling_policy_evaluation_error
+
+Count of sampling policy evaluation errors
+
+| Unit | Metric Type | Value Type | Monotonic |
+| ---- | ----------- | ---------- | --------- |
+| {errors} | Sum | Int | true |
+
+### 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 |
+
+### 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 |
+
+### processor_tail_sampling_sampling_traces_on_memory
+
+Tracks the number of traces current on memory
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {traces} | Gauge | Int |

processor/tailsamplingprocessor/go.mod

@@ -9,15 +9,16 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/filter v0.102.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl v0.102.0
 	github.com/stretchr/testify v1.9.0
-	go.opencensus.io v0.24.0
 	go.opentelemetry.io/collector/component v0.102.2-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/config/configtelemetry v0.102.2-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/confmap v0.102.2-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/consumer v0.102.2-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/featuregate v1.9.1-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/pdata v1.9.1-0.20240606174409-6888f8f7a45f
 	go.opentelemetry.io/collector/processor v0.102.2-0.20240606174409-6888f8f7a45f
+	go.opentelemetry.io/otel v1.27.0
 	go.opentelemetry.io/otel/metric v1.27.0
+	go.opentelemetry.io/otel/sdk/metric v1.27.0
 	go.opentelemetry.io/otel/trace v1.27.0
 	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.27.0
@@ -28,7 +29,7 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-viper/mapstructure/v2 v2.0.0-alpha.1 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
@@ -49,12 +50,9 @@ require (
 	github.com/prometheus/client_model v0.6.1 // indirect
 	github.com/prometheus/common v0.54.0 // indirect
 	github.com/prometheus/procfs v0.15.0 // indirect
-	go.opentelemetry.io/collector v0.102.2-0.20240606174409-6888f8f7a45f // indirect
 	go.opentelemetry.io/collector/pdata/testdata v0.102.2-0.20240606174409-6888f8f7a45f // indirect
-	go.opentelemetry.io/otel v1.27.0 // indirect
 	go.opentelemetry.io/otel/exporters/prometheus v0.49.0 // indirect
 	go.opentelemetry.io/otel/sdk v1.27.0 // indirect
-	go.opentelemetry.io/otel/sdk/metric v1.27.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
 	golang.org/x/net v0.25.0 // indirect