Add clarifying statement about ignore

.chloggen/rp-error-mode.yaml

@@ -13,4 +13,4 @@ issues: [19147]
 # (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:
+subtext: If a condition errors when using `ignore` the payload will be routed to the default exporter.

processor/routingprocessor/README.md

@@ -61,7 +61,7 @@ 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 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` 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.
 
 
 ```yaml

processor/routingprocessor/config.go

@@ -59,6 +59,7 @@ type Config struct {
 	// ErrorMode determines how the processor reacts to errors that occur while processing an OTTL condition.
 	// Valid values are `ignore` and `propagate`.
 	// `ignore` means the processor ignores errors returned by conditions and continues on to the next condition. This is the recommended mode.
+	// If `ignored` is used and a statement's condition has an error then the payload will be routed to the default exporter.
 	// `propagate` means the processor returns the error up the pipeline.  This will result in the payload being dropped from the collector.
 	// The default value is `propagate`.
 	ErrorMode ottl.ErrorMode `mapstructure:"error_mode"`