[pkg/ottl] Add new silent ErrorMode (#29710)

**Description:**
Adds a new ErrorMode, `silent`, that `StatementSequence` and
`ConditionSequence` can use to disable logging when ignoring errors.

**Link to tracking Issue:** 

Closes
#22743

**Testing:**
Updated unit tests

**Documentation:** 
Updated READMEs and godoc comments.

Author: TylerHelmuth

.chloggen/ottl-silent-error-mode.yaml

@@ -0,0 +1,27 @@
+# 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: pkg/ottl
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `silent` ErrorMode to allow disabling logging of errors that are ignored.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [29710]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: []

connector/routingconnector/README.md

@@ -35,7 +35,7 @@ The following settings are available:
 - `table.statement (required)`: the routing condition provided as the [OTTL] statement.
 - `table.pipelines (required)`: the list of pipelines to use when the routing condition is met.
 - `default_pipelines (optional)`: contains the list of pipelines to use when a record does not meet any of specified conditions.
-- `error_mode (optional)`: determines how errors returned from OTTL statements are handled. Valid values are `ignore` and `propagate`. If `ignored` is used and a statement's condition has an error then the payload will be routed to the default pipelines.  If not supplied, `propagate` is used.
+- `error_mode (optional)`: determines how errors returned from OTTL statements are handled. Valid values are `propagate`, `ignore` and `silent`. If `ignored` or `silent` is used and a statement's condition has an error then the payload will be routed to the default pipelines. When `silent` is used the error is not logged. If not supplied, `propagate` is used.
 
 Example:
 

pkg/ottl/config.go

@@ -13,12 +13,13 @@ type ErrorMode string
 const (
 	IgnoreError    ErrorMode = "ignore"
 	PropagateError ErrorMode = "propagate"
+	SilentError    ErrorMode = "silent"
 )
 
 func (e *ErrorMode) UnmarshalText(text []byte) error {
 	str := ErrorMode(strings.ToLower(string(text)))
 	switch str {
-	case IgnoreError, PropagateError:
+	case IgnoreError, PropagateError, SilentError:
 		*e = str
 		return nil
 	default:

pkg/ottl/parser.go

@@ -260,6 +260,7 @@ func NewStatementSequence[K any](statements []*Statement[K], telemetrySettings c
 // Execute is a function that will execute all the statements in the StatementSequence list.
 // When the ErrorMode of the StatementSequence is `propagate`, errors cause the execution to halt and the error is returned.
 // When the ErrorMode of the StatementSequence is `ignore`, errors are logged and execution continues to the next statement.
+// When the ErrorMode of the StatementSequence is `silent`, errors are not logged and execution continues to the next statement.
 func (s *StatementSequence[K]) Execute(ctx context.Context, tCtx K) error {
 	for _, statement := range s.statements {
 		_, _, err := statement.Execute(ctx, tCtx)
@@ -268,7 +269,9 @@ func (s *StatementSequence[K]) Execute(ctx context.Context, tCtx K) error {
 				err = fmt.Errorf("failed to execute statement: %v, %w", statement.origText, err)
 				return err
 			}
-			s.telemetrySettings.Logger.Warn("failed to execute statement", zap.Error(err), zap.String("statement", statement.origText))
+			if s.errorMode == IgnoreError {
+				s.telemetrySettings.Logger.Warn("failed to execute statement", zap.Error(err), zap.String("statement", statement.origText))
+			}
 		}
 	}
 	return nil
@@ -323,7 +326,8 @@ func NewConditionSequence[K any](conditions []*Condition[K], telemetrySettings c
 // If using the default OR LogicOperation, if any Condition evaluates to true, then true is returned and if all Conditions evaluate to false, then false is returned.
 // If using the AND LogicOperation, if any Condition evaluates to false, then false is returned and if all Conditions evaluate to true, then true is returned.
 // When the ErrorMode of the ConditionSequence is `propagate`, errors cause the evaluation to be false and an error is returned.
-// When the ErrorMode of the ConditionSequence is `ignore`, errors cause the evaluation to continue to the next condition.
+// When the ErrorMode of the ConditionSequence is `ignore`, errors are logged and cause the evaluation to continue to the next condition.
+// When the ErrorMode of the ConditionSequence is `silent`, errors are not logged and cause the evaluation to continue to the next condition.
 // When using the AND LogicOperation with the `ignore` ErrorMode the sequence will evaluate to false if all conditions error.
 func (c *ConditionSequence[K]) Eval(ctx context.Context, tCtx K) (bool, error) {
 	var atLeastOneMatch bool
@@ -334,7 +338,9 @@ func (c *ConditionSequence[K]) Eval(ctx context.Context, tCtx K) (bool, error) {
 				err = fmt.Errorf("failed to eval condition: %v, %w", condition.origText, err)
 				return false, err
 			}
-			c.telemetrySettings.Logger.Warn("failed to eval condition", zap.Error(err), zap.String("condition", condition.origText))
+			if c.errorMode == IgnoreError {
+				c.telemetrySettings.Logger.Warn("failed to eval condition", zap.Error(err), zap.String("condition", condition.origText))
+			}
 			continue
 		}
 		if match {

pkg/ottl/parser_test.go

@@ -2091,6 +2091,26 @@ func Test_Statements_Execute_Error(t *testing.T) {
 			},
 			errorMode: PropagateError,
 		},
+		{
+			name: "SilentError error from condition",
+			condition: func(context.Context, any) (bool, error) {
+				return true, fmt.Errorf("test")
+			},
+			function: func(ctx context.Context, tCtx any) (any, error) {
+				return 1, nil
+			},
+			errorMode: SilentError,
+		},
+		{
+			name: "SilentError error from function",
+			condition: func(context.Context, any) (bool, error) {
+				return true, nil
+			},
+			function: func(ctx context.Context, tCtx any) (any, error) {
+				return 1, fmt.Errorf("test")
+			},
+			errorMode: SilentError,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -2262,14 +2282,32 @@ func Test_ConditionSequence_Eval_Error(t *testing.T) {
 		errorMode  ErrorMode
 	}{
 		{
-			name: "Propagate Error from function",
+			name: "Propagate Error from condition",
 			conditions: []boolExpressionEvaluator[any]{
 				func(context.Context, any) (bool, error) {
 					return true, fmt.Errorf("test")
 				},
 			},
 			errorMode: PropagateError,
 		},
+		{
+			name: "Ignore Error from function with IgnoreError",
+			conditions: []boolExpressionEvaluator[any]{
+				func(context.Context, any) (bool, error) {
+					return true, fmt.Errorf("test")
+				},
+			},
+			errorMode: IgnoreError,
+		},
+		{
+			name: "Ignore Error from function with SilentError",
+			conditions: []boolExpressionEvaluator[any]{
+				func(context.Context, any) (bool, error) {
+					return true, fmt.Errorf("test")
+				},
+			},
+			errorMode: SilentError,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -2287,8 +2325,12 @@ func Test_ConditionSequence_Eval_Error(t *testing.T) {
 			}
 
 			result, err := conditions.Eval(context.Background(), nil)
-			assert.Error(t, err)
 			assert.False(t, result)
+			if tt.errorMode == PropagateError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
 		})
 	}
 }

processor/filterprocessor/README.md

@@ -48,10 +48,11 @@ If all datapoints for a metric are dropped, the metric will also be dropped.
 
 The filter processor also allows configuring an optional field, `error_mode`, which will determine how the processor reacts to errors that occur while processing an OTTL condition.
 
-| error_mode            | description                                                                                                                |
-|-----------------------|----------------------------------------------------------------------------------------------------------------------------|
-| ignore                | The processor ignores errors returned by conditions and continues on to the next condition.  This is the recommended mode. |
-| propagate             | The processor returns the error up the pipeline.  This will result in the payload being dropped from the collector.        |
+| error_mode | description                                                                                                                            |
+|------------|----------------------------------------------------------------------------------------------------------------------------------------|
+| ignore     | The processor ignores errors returned by conditions, logs them, and continues on to the next condition.  This is the recommended mode. |
+| silent     | The processor ignores errors returned by conditions, does not log them, and continues on to the next condition.                        |
+| propagate  | The processor returns the error up the pipeline.  This will result in the payload being dropped from the collector.                    |
 
 If not specified, `propagate` will be used.
 

processor/routingprocessor/README.md

@@ -71,7 +71,7 @@ To configure the routing processor with [OTTL] routing conditions use the follow
 - `table.statement (required)`: the routing condition provided as the [OTTL] statement.
 - `table.exporters (required)`: the list of exporters to use when the routing condition is met.
 - `default_exporters (optional)`: contains the list of exporters to use when a record does not meet any of specified conditions.
-- `error_mode (optional)`: determines how errors returned from OTTL statements are handled. Valid values are `ignore` and `propagate`. If `ignored` is used and a statement's condition has an error then the payload will be routed to the default exporter.  If not supplied, `propagate` is used.
+- `error_mode (optional)`: determines how errors returned from OTTL statements are handled. Valid values are `ignore` and `propagate`. If `ignored` or `silent` is used and a statement's condition has an error then the payload will be routed to the default exporter. When `silent` is used the error is not logged. If not supplied, `propagate` is used.
 
 
 ```yaml

processor/transformprocessor/README.md

@@ -37,10 +37,11 @@ Each context will be processed in the order specified and each statement for a c
 
 The transform processor also allows configuring an optional field, `error_mode`, which will determine how the processor reacts to errors that occur while processing a statement.
 
-| error_mode            | description                                                                                                                |
-|-----------------------|----------------------------------------------------------------------------------------------------------------------------|
-| ignore                | The processor ignores errors returned by statements and continues on to the next statement.  This is the recommended mode. |
-| propagate             | The processor returns the error up the pipeline.  This will result in the payload being dropped from the collector.        |
+| error_mode | description                                                                                                                                 |
+|------------|---------------------------------------------------------------------------------------------------------------------------------------------|
+| ignore     | The processor ignores errors returned by statements, logs the error, and continues on to the next statement.  This is the recommended mode. |
+| silent     | The processor ignores errors returned by statements, does not log the error, and continues on to the next statement.                        |
+| propagate  | The processor returns the error up the pipeline.  This will result in the payload being dropped from the collector.                         |
 
 If not specified, `propagate` will be used.