feat: add max_processing_time config to Kafka Consumer input

plugins/inputs/kafka_consumer/README.md

@@ -93,6 +93,15 @@ and use the old zookeeper connection method.
   ## waiting until the next flush_interval.
   # max_undelivered_messages = 1000
 
+  ## Maximum amount of time the consumer should take to process messages. If
+  ## the debug log prints messages from sarama about 'abandoning subscription
+  ## to [topic] because consuming was taking too long', increase this value to
+  ## longer than the time taken by the output plugin(s).
+  ##
+  ## Note that the effective timeout could be between 'max_processing_time' and
+  ## '2 * max_processing_time'.
+  # max_processing_time = "100ms"
+
   ## Data format to consume.
   ## Each data format has its own unique set of configuration options, read
   ## more about them here:

plugins/inputs/kafka_consumer/kafka_consumer.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/Shopify/sarama"
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/internal"
 	"github.com/influxdata/telegraf/plugins/common/kafka"
 	"github.com/influxdata/telegraf/plugins/inputs"
@@ -101,6 +102,15 @@ const sampleConfig = `
   ## waiting until the next flush_interval.
   # max_undelivered_messages = 1000
 
+  ## Maximum amount of time the consumer should take to process messages. If
+  ## the debug log prints messages from sarama about 'abandoning subscription
+  ## to [topic] because consuming was taking too long', increase this value to
+  ## longer than the time taken by the output plugin(s).
+  ##
+  ## Note that the effective timeout could be between 'max_processing_time' and
+  ## '2 * max_processing_time'.
+  # max_processing_time = "100ms"
+
   ## Data format to consume.
   ## Each data format has its own unique set of configuration options, read
   ## more about them here:
@@ -110,6 +120,7 @@ const sampleConfig = `
 
 const (
 	defaultMaxUndeliveredMessages = 1000
+	defaultMaxProcessingTime      = config.Duration(100 * time.Millisecond)
 	defaultConsumerGroup          = "telegraf_metrics_consumers"
 	reconnectDelay                = 5 * time.Second
 )
@@ -118,14 +129,15 @@ type empty struct{}
 type semaphore chan empty
 
 type KafkaConsumer struct {
-	Brokers                []string `toml:"brokers"`
-	ConsumerGroup          string   `toml:"consumer_group"`
-	MaxMessageLen          int      `toml:"max_message_len"`
-	MaxUndeliveredMessages int      `toml:"max_undelivered_messages"`
-	Offset                 string   `toml:"offset"`
-	BalanceStrategy        string   `toml:"balance_strategy"`
-	Topics                 []string `toml:"topics"`
-	TopicTag               string   `toml:"topic_tag"`
+	Brokers                []string        `toml:"brokers"`
+	ConsumerGroup          string          `toml:"consumer_group"`
+	MaxMessageLen          int             `toml:"max_message_len"`
+	MaxUndeliveredMessages int             `toml:"max_undelivered_messages"`
+	MaxProcessingTime      config.Duration `toml:"max_processing_time"`
+	Offset                 string          `toml:"offset"`
+	BalanceStrategy        string          `toml:"balance_strategy"`
+	Topics                 []string        `toml:"topics"`
+	TopicTag               string          `toml:"topic_tag"`
 
 	kafka.ReadConfig
 
@@ -172,6 +184,9 @@ func (k *KafkaConsumer) Init() error {
 	if k.MaxUndeliveredMessages == 0 {
 		k.MaxUndeliveredMessages = defaultMaxUndeliveredMessages
 	}
+	if time.Duration(k.MaxProcessingTime) == 0 {
+		k.MaxProcessingTime = defaultMaxProcessingTime
+	}
 	if k.ConsumerGroup == "" {
 		k.ConsumerGroup = defaultConsumerGroup
 	}
@@ -209,6 +224,8 @@ func (k *KafkaConsumer) Init() error {
 		k.ConsumerCreator = &SaramaCreator{}
 	}
 
+	config.Consumer.MaxProcessingTime = time.Duration(k.MaxProcessingTime)
+
 	k.config = config
 	return nil
 }

plugins/inputs/kafka_consumer/kafka_consumer_test.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/Shopify/sarama"
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/common/kafka"
 	"github.com/influxdata/telegraf/plugins/common/tls"
 	"github.com/influxdata/telegraf/plugins/parsers/value"
@@ -63,6 +64,7 @@ func TestInit(t *testing.T) {
 				require.Equal(t, plugin.MaxUndeliveredMessages, defaultMaxUndeliveredMessages)
 				require.Equal(t, plugin.config.ClientID, "Telegraf")
 				require.Equal(t, plugin.config.Consumer.Offsets.Initial, sarama.OffsetOldest)
+				require.Equal(t, plugin.config.Consumer.MaxProcessingTime, 100*time.Millisecond)
 			},
 		},
 		{
@@ -164,6 +166,16 @@ func TestInit(t *testing.T) {
 				require.True(t, plugin.config.Net.TLS.Enable)
 			},
 		},
+		{
+			name: "custom max_processing_time",
+			plugin: &KafkaConsumer{
+				MaxProcessingTime: config.Duration(1000 * time.Millisecond),
+				Log:               testutil.Logger{},
+			},
+			check: func(t *testing.T, plugin *KafkaConsumer) {
+				require.Equal(t, plugin.config.Consumer.MaxProcessingTime, 1000*time.Millisecond)
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {