feat(plugins): Allow to override log-level per plugin (#15677)

config/config.go

@@ -971,26 +971,30 @@ func (c *Config) probeParser(parentcategory string, parentname string, table *as
 }
 
 func (c *Config) addParser(parentcategory, parentname string, table *ast.Table) (*models.RunningParser, error) {
-	var dataformat string
-	c.getFieldString(table, "data_format", &dataformat)
-	if dataformat == "" {
-		dataformat = setDefaultParser(parentcategory, parentname)
+	conf := &models.ParserConfig{
+		Parent: parentname,
 	}
 
-	var influxParserType string
-	c.getFieldString(table, "influx_parser_type", &influxParserType)
-	if dataformat == "influx" && influxParserType == "upstream" {
-		dataformat = "influx_upstream"
+	c.getFieldString(table, "data_format", &conf.DataFormat)
+	if conf.DataFormat == "" {
+		conf.DataFormat = setDefaultParser(parentcategory, parentname)
+	} else if conf.DataFormat == "influx" {
+		var influxParserType string
+		c.getFieldString(table, "influx_parser_type", &influxParserType)
+		if influxParserType == "upstream" {
+			conf.DataFormat = "influx_upstream"
+		}
 	}
+	c.getFieldString(table, "log_level", &conf.LogLevel)
 
-	creator, ok := parsers.Parsers[dataformat]
+	creator, ok := parsers.Parsers[conf.DataFormat]
 	if !ok {
-		return nil, fmt.Errorf("undefined but requested parser: %s", dataformat)
+		return nil, fmt.Errorf("undefined but requested parser: %s", conf.DataFormat)
 	}
 	parser := creator(parentname)
 
 	// Handle reset-mode of CSV parsers to stay backward compatible (see issue #12022)
-	if dataformat == "csv" && parentcategory == "inputs" {
+	if conf.DataFormat == "csv" && parentcategory == "inputs" {
 		if parentname == "exec" {
 			csvParser := parser.(*csv.Parser)
 			csvParser.ResetMode = "always"
@@ -1001,25 +1005,24 @@ func (c *Config) addParser(parentcategory, parentname string, table *ast.Table)
 		return nil, err
 	}
 
-	conf := &models.ParserConfig{
-		Parent:     parentname,
-		DataFormat: dataformat,
-	}
 	running := models.NewRunningParser(parser, conf)
 	err := running.Init()
 	return running, err
 }
 
 func (c *Config) addSerializer(parentname string, table *ast.Table) (*models.RunningSerializer, error) {
-	var dataformat string
-	c.getFieldString(table, "data_format", &dataformat)
-	if dataformat == "" {
-		dataformat = "influx"
+	conf := &models.SerializerConfig{
+		Parent: parentname,
 	}
+	c.getFieldString(table, "data_format", &conf.DataFormat)
+	if conf.DataFormat == "" {
+		conf.DataFormat = "influx"
+	}
+	c.getFieldString(table, "log_level", &conf.LogLevel)
 
-	creator, ok := serializers.Serializers[dataformat]
+	creator, ok := serializers.Serializers[conf.DataFormat]
 	if !ok {
-		return nil, fmt.Errorf("undefined but requested serializer: %s", dataformat)
+		return nil, fmt.Errorf("undefined but requested serializer: %s", conf.DataFormat)
 	}
 	serializer := creator()
 
@@ -1027,10 +1030,6 @@ func (c *Config) addSerializer(parentname string, table *ast.Table) (*models.Run
 		return nil, err
 	}
 
-	conf := &models.SerializerConfig{
-		Parent:     parentname,
-		DataFormat: dataformat,
-	}
 	running := models.NewRunningSerializer(serializer, conf)
 	err := running.Init()
 	return running, err
@@ -1336,6 +1335,7 @@ func (c *Config) buildAggregator(name string, tbl *ast.Table) (*models.Aggregato
 	c.getFieldString(tbl, "name_suffix", &conf.MeasurementSuffix)
 	c.getFieldString(tbl, "name_override", &conf.NameOverride)
 	c.getFieldString(tbl, "alias", &conf.Alias)
+	c.getFieldString(tbl, "log_level", &conf.LogLevel)
 
 	conf.Tags = make(map[string]string)
 	if node, ok := tbl.Fields["tags"]; ok {
@@ -1369,6 +1369,7 @@ func (c *Config) buildProcessor(category, name string, tbl *ast.Table) (*models.
 
 	c.getFieldInt64(tbl, "order", &conf.Order)
 	c.getFieldString(tbl, "alias", &conf.Alias)
+	c.getFieldString(tbl, "log_level", &conf.LogLevel)
 
 	if c.hasErrs() {
 		return nil, c.firstErr()
@@ -1478,6 +1479,7 @@ func (c *Config) buildInput(name string, tbl *ast.Table) (*models.InputConfig, e
 	c.getFieldString(tbl, "name_suffix", &cp.MeasurementSuffix)
 	c.getFieldString(tbl, "name_override", &cp.NameOverride)
 	c.getFieldString(tbl, "alias", &cp.Alias)
+	c.getFieldString(tbl, "log_level", &cp.LogLevel)
 
 	cp.Tags = make(map[string]string)
 	if node, ok := tbl.Fields["tags"]; ok {
@@ -1523,7 +1525,6 @@ func (c *Config) buildOutput(name string, tbl *ast.Table) (*models.OutputConfig,
 
 	c.getFieldDuration(tbl, "flush_interval", &oc.FlushInterval)
 	c.getFieldDuration(tbl, "flush_jitter", &oc.FlushJitter)
-
 	c.getFieldInt(tbl, "metric_buffer_limit", &oc.MetricBufferLimit)
 	c.getFieldInt(tbl, "metric_batch_size", &oc.MetricBatchSize)
 	c.getFieldString(tbl, "alias", &oc.Alias)
@@ -1531,6 +1532,7 @@ func (c *Config) buildOutput(name string, tbl *ast.Table) (*models.OutputConfig,
 	c.getFieldString(tbl, "name_suffix", &oc.NameSuffix)
 	c.getFieldString(tbl, "name_prefix", &oc.NamePrefix)
 	c.getFieldString(tbl, "startup_error_behavior", &oc.StartupErrorBehavior)
+	c.getFieldString(tbl, "log_level", &oc.LogLevel)
 
 	if c.hasErrs() {
 		return nil, c.firstErr()
@@ -1555,7 +1557,7 @@ func (c *Config) missingTomlField(_ reflect.Type, key string) error {
 		"fielddrop", "fieldexclude", "fieldinclude", "fieldpass", "flush_interval", "flush_jitter",
 		"grace",
 		"interval",
-		"lvm", // What is this used for?
+		"log_level", "lvm", // What is this used for?
 		"metric_batch_size", "metric_buffer_limit", "metricpass",
 		"name_override", "name_prefix", "name_suffix", "namedrop", "namedrop_separator", "namepass", "namepass_separator",
 		"order",

docs/CONFIGURATION.md

@@ -385,38 +385,32 @@ driven operation.
 Parameters that can be used with any input plugin:
 
 - **alias**: Name an instance of a plugin.
-
 - **interval**:
   Overrides the `interval` setting of the [agent][Agent] for the plugin.  How
   often to gather this metric. Normal plugins use a single global interval, but
   if one particular input should be run less or more often, you can configure
   that here.
-
 - **precision**:
   Overrides the `precision` setting of the [agent][Agent] for the plugin.
   Collected metrics are rounded to the precision specified as an [interval][].
 
   When this value is set on a service input, multiple events occurring at the
   same timestamp may be merged by the output database.
-
 - **collection_jitter**:
   Overrides the `collection_jitter` setting of the [agent][Agent] for the
   plugin.  Collection jitter is used to jitter the collection by a random
   [interval][]. The value must be non-zero to override the agent setting.
-
 - **collection_offset**:
   Overrides the `collection_offset` setting of the [agent][Agent] for the
   plugin. Collection offset is used to shift the collection by the given
   [interval][]. The value must be non-zero to override the agent setting.
-
 - **name_override**: Override the base name of the measurement.  (Default is
   the name of the input).
-
 - **name_prefix**: Specifies a prefix to attach to the measurement name.
-
 - **name_suffix**: Specifies a suffix to attach to the measurement name.
-
 - **tags**: A map of tags to apply to a specific input's measurements.
+- **log_level**: Override the log-level for this plugin. Possible values are
+  `error`, `warn`, `info` and `debug`.
 
 The [metric filtering][] parameters can be used to limit what metrics are
 emitted from the input plugin.
@@ -502,6 +496,8 @@ Parameters that can be used with any output plugin:
 - **name_override**: Override the original name of the measurement.
 - **name_prefix**: Specifies a prefix to attach to the measurement name.
 - **name_suffix**: Specifies a suffix to attach to the measurement name.
+- **log_level**: Override the log-level for this plugin. Possible values are
+  `error`, `warn`, `info` and `debug`.
 
 The [metric filtering][] parameters can be used to limit what metrics are
 emitted from the output plugin.
@@ -540,6 +536,8 @@ Parameters that can be used with any processor plugin:
   If this is not specified then processor execution order will be the order in
   the config. Processors without "order" will take precedence over those
   with a defined order.
+- **log_level**: Override the log-level for this plugin. Possible values are
+  `error`, `warn`, `info` and `debug`.
 
 The [metric filtering][] parameters can be used to limit what metrics are
 handled by the processor.  Excluded metrics are passed downstream to the next
@@ -592,6 +590,8 @@ Parameters that can be used with any aggregator plugin:
 - **name_prefix**: Specifies a prefix to attach to the measurement name.
 - **name_suffix**: Specifies a suffix to attach to the measurement name.
 - **tags**: A map of tags to apply to the measurement - behavior varies based on aggregator.
+- **log_level**: Override the log-level for this plugin. Possible values are
+  `error`, `warn`, `info` and `debug`.
 
 The [metric filtering][] parameters can be used to limit what metrics are
 handled by the aggregator.  Excluded metrics are passed downstream to the next

logger.go

@@ -16,6 +16,20 @@ const (
 	Debug
 )
 
+func LogLevelFromString(name string) LogLevel {
+	switch name {
+	case "ERROR", "error":
+		return Error
+	case "WARN", "warn":
+		return Warn
+	case "INFO", "info":
+		return Info
+	case "DEBUG", "debug":
+		return Debug
+	}
+	return None
+}
+
 func (e LogLevel) String() string {
 	switch e {
 	case Error:

logger/logger.go

@@ -55,6 +55,19 @@ func New(category, name, alias string) *logger {
 	return l
 }
 
+// SetLevel changes the log-level to the given one
+func (l *logger) SetLogLevel(name string) error {
+	if name == "" {
+		return nil
+	}
+	level := telegraf.LogLevelFromString(name)
+	if level == telegraf.None {
+		return fmt.Errorf("invalid log-level %q", name)
+	}
+	l.level = &level
+	return nil
+}
+
 // SubLogger creates a new logger with the given name added as suffix
 func (l *logger) SubLogger(name string) telegraf.Logger {
 	suffix := l.suffix

models/running_aggregator.go

@@ -35,7 +35,9 @@ func NewRunningAggregator(aggregator telegraf.Aggregator, config *AggregatorConf
 	logger.RegisterErrorCallback(func() {
 		aggErrorsRegister.Incr(1)
 	})
-
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(aggregator, logger)
 
 	return &RunningAggregator{
@@ -74,6 +76,7 @@ type AggregatorConfig struct {
 	Period       time.Duration
 	Delay        time.Duration
 	Grace        time.Duration
+	LogLevel     string
 
 	NameOverride      string
 	MeasurementPrefix string

models/running_input.go

@@ -46,6 +46,9 @@ func NewRunningInput(input telegraf.Input, config *InputConfig) *RunningInput {
 		inputErrorsRegister.Incr(1)
 		GlobalGatherErrors.Incr(1)
 	})
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(input, logger)
 
 	return &RunningInput{
@@ -85,6 +88,7 @@ type InputConfig struct {
 	CollectionOffset     time.Duration
 	Precision            time.Duration
 	StartupErrorBehavior string
+	LogLevel             string
 
 	NameOverride            string
 	MeasurementPrefix       string

models/running_output.go

@@ -40,6 +40,8 @@ type OutputConfig struct {
 
 	BufferStrategy  string
 	BufferDirectory string
+
+	LogLevel string
 }
 
 // RunningOutput contains the output configuration
@@ -84,6 +86,9 @@ func NewRunningOutput(
 	logger.RegisterErrorCallback(func() {
 		writeErrorsRegister.Incr(1)
 	})
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(output, logger)
 
 	if config.MetricBufferLimit > 0 {

models/running_parsers.go

@@ -28,6 +28,9 @@ func NewRunningParser(parser telegraf.Parser, config *ParserConfig) *RunningPars
 	logger.RegisterErrorCallback(func() {
 		parserErrorsRegister.Incr(1)
 	})
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(parser, logger)
 
 	return &RunningParser{
@@ -53,6 +56,7 @@ type ParserConfig struct {
 	Alias       string
 	DataFormat  string
 	DefaultTags map[string]string
+	LogLevel    string
 }
 
 func (r *RunningParser) LogName() string {

models/running_processor.go

@@ -23,11 +23,12 @@ func (rp RunningProcessors) Less(i, j int) bool { return rp[i].Config.Order < rp
 
 // ProcessorConfig containing a name and filter
 type ProcessorConfig struct {
-	Name   string
-	Alias  string
-	ID     string
-	Order  int64
-	Filter Filter
+	Name     string
+	Alias    string
+	ID       string
+	Order    int64
+	Filter   Filter
+	LogLevel string
 }
 
 func NewRunningProcessor(processor telegraf.StreamingProcessor, config *ProcessorConfig) *RunningProcessor {
@@ -41,6 +42,9 @@ func NewRunningProcessor(processor telegraf.StreamingProcessor, config *Processo
 	logger.RegisterErrorCallback(func() {
 		processErrorsRegister.Incr(1)
 	})
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(processor, logger)
 
 	return &RunningProcessor{

models/running_serializer.go

@@ -15,6 +15,7 @@ type SerializerConfig struct {
 	Alias       string
 	DataFormat  string
 	DefaultTags map[string]string
+	LogLevel    string
 }
 
 type RunningSerializer struct {
@@ -38,6 +39,9 @@ func NewRunningSerializer(serializer serializers.Serializer, config *SerializerC
 	logger.RegisterErrorCallback(func() {
 		serializerErrorsRegister.Incr(1)
 	})
+	if err := logger.SetLogLevel(config.LogLevel); err != nil {
+		logger.Error(err)
+	}
 	SetLoggerOnPlugin(serializer, logger)
 
 	return &RunningSerializer{