[exporter/debug] disable sampling by default

.chloggen/debug-exporter-disable-sampling.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: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporter/debug
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Disable sampling by default
+
+# One or more tracking issues or pull requests related to the change
+issues: [9921]
+
+# (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: To restore the behavior that was previously the default, set `sampling_thereafter` to `500`.
+
+# 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: []

exporter/debugexporter/README.md

@@ -28,9 +28,11 @@ The following settings are optional:
   logged.
 - `sampling_initial` (default = `2`): number of messages initially logged each
   second.
-- `sampling_thereafter` (default = `500`): sampling rate after the initial
-  messages are logged (every Mth message is logged). Refer to [Zap
-  docs](https://godoc.org/go.uber.org/zap/zapcore#NewSampler) for more details.
+- `sampling_thereafter` (default = `1`): sampling rate after the initial
+  messages are logged (every Mth message is logged).
+  The default value of `1` means that sampling is disabled.
+  To enable sampling, change `sampling_thereafter` to a value higher than `1`.
+  Refer to [Zap docs](https://godoc.org/go.uber.org/zap/zapcore#NewSampler) for more details
   on how sampling parameters impact number of messages.
 
 Example configuration:
@@ -109,4 +111,4 @@ Attributes:
 
 ## Warnings
 
-- Unstable Output Format: The output formats for all verbosity levels is not guaranteed and may be changed at any time without a breaking change.
+- Unstable Output Format: The output formats for all verbosity levels is not guaranteed and may be changed at any time without a breaking change.

exporter/debugexporter/factory.go

@@ -24,7 +24,7 @@ var componentType = component.MustNewType("debug")
 
 const (
 	defaultSamplingInitial    = 2
-	defaultSamplingThereafter = 500
+	defaultSamplingThereafter = 1
 )
 
 // NewFactory creates a factory for Debug exporter