[configtelemetry] add guidelines for each level of config telemetry

Author: atoulme

.chloggen/add_guidelines_telemetry.yaml

@@ -0,0 +1,25 @@
+# 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. otlpreceiver)
+component: configtelemetry
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add guidelines for each level of component telemetry
+
+# One or more tracking issues or pull requests related to the change
+issues: [10286]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

config/configtelemetry/doc.go

@@ -4,4 +4,46 @@
 // Package configtelemetry defines various telemetry level for configuration.
 // It enables every component to have access to telemetry level
 // to enable metrics only when necessary.
+//
+// 1. configtelemetry.None
+//
+// No telemetry data should be collected.
+//
+// 2. configtelemetry.Basic
+//
+// Signals associated with this level cover the essential coverage of the component telemetry.
+//
+// This is the default level recommended when running the collector.
+//
+// The signals associated with this level must have low cardinality.
+//
+// The signals associated with this level must represent a small data volume:
+//   - No more than 5 metrics reported.
+//   - At most 1 span actively recording simultaneously, covering the critical path.
+//   - At most 5 log records produced every 30s.
+//
+// Not all signals defined in the component telemetry are active.
+//
+// 3. configtelemetry.Normal
+//
+// Signals associated with this level cover the complete coverage of the component telemetry.
+//
+// The signals associated with this level must control cardinality.
+//
+// The signals associated with this level must represent a controlled data volume:
+//   - No more than 20 metrics reported.
+//   - At most 5 spans actively recording simultaneously.
+//   - At most 20 log records produced every 30s.
+//
+// All signals defined in the component telemetry are active.
+//
+// 4. configtelemetry.Detailed
+//
+// Signals associated with this level cover the complete coverage of the component telemetry.
+//
+// The signals associated with this level may exhibit high cardinality.
+//
+// There is no limit on data volume.
+//
+// All signals defined in the component telemetry are active.
 package configtelemetry // import "go.opentelemetry.io/collector/config/configtelemetry"