feat: migrate processor plugins to new sample config format

plugins/processors/aws/ec2/README.md

@@ -8,7 +8,12 @@ to metrics associated with EC2 instances.
 ## Configuration
 
 ```toml
+# Attach AWS EC2 metadata to metrics
 [[processors.aws_ec2]]
+  ## Instance identity document tags to attach to metrics.
+  ## For more information see:
+  ## https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html
+  ##
   ## Available tags:
   ## * accountId
   ## * architecture

plugins/processors/aws/ec2/ec2.go

@@ -35,54 +35,6 @@ type AwsEc2Processor struct {
 	instanceID  string
 }
 
-const sampleConfig = `
-  ## Instance identity document tags to attach to metrics.
-  ## For more information see:
-  ## https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html
-  ##
-  ## Available tags:
-  ## * accountId
-  ## * architecture
-  ## * availabilityZone
-  ## * billingProducts
-  ## * imageId
-  ## * instanceId
-  ## * instanceType
-  ## * kernelId
-  ## * pendingTime
-  ## * privateIp
-  ## * ramdiskId
-  ## * region
-  ## * version
-  imds_tags = []
-
-  ## EC2 instance tags retrieved with DescribeTags action.
-  ## In case tag is empty upon retrieval it's omitted when tagging metrics.
-  ## Note that in order for this to work, role attached to EC2 instance or AWS
-  ## credentials available from the environment must have a policy attached, that
-  ## allows ec2:DescribeTags.
-  ##
-  ## For more information see:
-  ## https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeTags.html
-  ec2_tags = []
-
-  ## Timeout for http requests made by against aws ec2 metadata endpoint.
-  timeout = "10s"
-
-  ## ordered controls whether or not the metrics need to stay in the same order
-  ## this plugin received them in. If false, this plugin will change the order
-  ## with requests hitting cached results moving through immediately and not
-  ## waiting on slower lookups. This may cause issues for you if you are
-  ## depending on the order of metrics staying the same. If so, set this to true.
-  ## Keeping the metrics ordered may be slightly slower.
-  ordered = false
-
-  ## max_parallel_calls is the maximum number of AWS API calls to be in flight
-  ## at the same time.
-  ## It's probably best to keep this number fairly low.
-  max_parallel_calls = 10
-`
-
 const (
 	DefaultMaxOrderedQueueSize = 10_000
 	DefaultMaxParallelCalls    = 10
@@ -105,14 +57,6 @@ var allowedImdsTags = map[string]struct{}{
 	"version":          {},
 }
 
-func (r *AwsEc2Processor) SampleConfig() string {
-	return sampleConfig
-}
-
-func (r *AwsEc2Processor) Description() string {
-	return "Attach AWS EC2 metadata to metrics"
-}
-
 func (r *AwsEc2Processor) Add(metric telegraf.Metric, _ telegraf.Accumulator) error {
 	r.parallel.Enqueue(metric)
 	return nil

plugins/processors/aws/ec2/ec2_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package ec2
+
+func (r *AwsEc2Processor) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/aws/ec2/ec2_test.go

@@ -3,7 +3,6 @@ package ec2
 import (
 	"testing"
 
-	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
 )
@@ -46,12 +45,3 @@ func TestBasicInitInvalidTagsReturnAnError(t *testing.T) {
 	err := p.Init()
 	require.Error(t, err)
 }
-
-func TestLoadingConfig(t *testing.T) {
-	confFile := []byte("[[processors.aws_ec2]]" + "\n" + sampleConfig)
-	c := config.NewConfig()
-	err := c.LoadConfigData(confFile)
-	require.NoError(t, err)
-
-	require.Len(t, c.Processors, 1)
-}

plugins/processors/clone/clone.go

@@ -5,32 +5,13 @@ import (
 	"github.com/influxdata/telegraf/plugins/processors"
 )
 
-var sampleConfig = `
-  ## All modifications on inputs and aggregators can be overridden:
-  # name_override = "new_name"
-  # name_prefix = "new_name_prefix"
-  # name_suffix = "new_name_suffix"
-
-  ## Tags to be added (all values must be strings)
-  # [processors.clone.tags]
-  #   additional_tag = "tag_value"
-`
-
 type Clone struct {
 	NameOverride string
 	NamePrefix   string
 	NameSuffix   string
 	Tags         map[string]string
 }
 
-func (c *Clone) SampleConfig() string {
-	return sampleConfig
-}
-
-func (c *Clone) Description() string {
-	return "Clone metrics and apply modifications."
-}
-
 func (c *Clone) Apply(in ...telegraf.Metric) []telegraf.Metric {
 	cloned := []telegraf.Metric{}
 

plugins/processors/clone/clone_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package clone
+
+func (c *Clone) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/converter/converter.go

@@ -13,35 +13,6 @@ import (
 	"github.com/influxdata/telegraf/plugins/processors"
 )
 
-var sampleConfig = `
-  ## Tags to convert
-  ##
-  ## The table key determines the target type, and the array of key-values
-  ## select the keys to convert.  The array may contain globs.
-  ##   <target-type> = [<tag-key>...]
-  [processors.converter.tags]
-    measurement = []
-    string = []
-    integer = []
-    unsigned = []
-    boolean = []
-    float = []
-
-  ## Fields to convert
-  ##
-  ## The table key determines the target type, and the array of key-values
-  ## select the keys to convert.  The array may contain globs.
-  ##   <target-type> = [<field-key>...]
-  [processors.converter.fields]
-    measurement = []
-    tag = []
-    string = []
-    integer = []
-    unsigned = []
-    boolean = []
-    float = []
-`
-
 type Conversion struct {
 	Measurement []string `toml:"measurement"`
 	Tag         []string `toml:"tag"`
@@ -71,14 +42,6 @@ type ConversionFilter struct {
 	Float       filter.Filter
 }
 
-func (p *Converter) SampleConfig() string {
-	return sampleConfig
-}
-
-func (p *Converter) Description() string {
-	return "Convert values to another metric value type"
-}
-
 func (p *Converter) Init() error {
 	return p.compile()
 }

plugins/processors/converter/converter_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package converter
+
+func (p *Converter) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/date/README.md

@@ -13,6 +13,7 @@ A few example usecases include:
 ## Configuration
 
 ```toml
+# Dates measurements, tags, and fields that pass through this filter.
 [[processors.date]]
   ## New tag to create
   tag_key = "month"

plugins/processors/date/date.go

@@ -9,31 +9,6 @@ import (
 	"github.com/influxdata/telegraf/plugins/processors"
 )
 
-const sampleConfig = `
-	## New tag to create
-	tag_key = "month"
-
-	## New field to create (cannot set both field_key and tag_key)
-	# field_key = "month"
-
-	## Date format string, must be a representation of the Go "reference time"
-	## which is "Mon Jan 2 15:04:05 -0700 MST 2006".
-	date_format = "Jan"
-
-	## If destination is a field, date format can also be one of
-	## "unix", "unix_ms", "unix_us", or "unix_ns", which will insert an integer field.
-	# date_format = "unix"
-
-	## Offset duration added to the date string when writing the new tag.
-	# date_offset = "0s"
-
-	## Timezone to use when creating the tag or field using a reference time
-	## string.  This can be set to one of "UTC", "Local", or to a location name
-	## in the IANA Time Zone database.
-	##   example: timezone = "America/Los_Angeles"
-	# timezone = "UTC"
-`
-
 const defaultTimezone = "UTC"
 
 type Date struct {
@@ -46,14 +21,6 @@ type Date struct {
 	location *time.Location
 }
 
-func (d *Date) SampleConfig() string {
-	return sampleConfig
-}
-
-func (d *Date) Description() string {
-	return "Dates measurements, tags, and fields that pass through this filter."
-}
-
 func (d *Date) Init() error {
 	// Check either TagKey or FieldKey specified
 	if len(d.FieldKey) > 0 && len(d.TagKey) > 0 {

plugins/processors/date/date_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package date
+
+func (d *Date) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/dedup/README.md

@@ -5,6 +5,7 @@ Filter metrics whose field values are exact repetitions of the previous values.
 ## Configuration
 
 ```toml
+# Filter metrics with repeating field values
 [[processors.dedup]]
   ## Maximum time to suppress output
   dedup_interval = "600s"

plugins/processors/dedup/dedup.go

@@ -8,25 +8,12 @@ import (
 	"github.com/influxdata/telegraf/plugins/processors"
 )
 
-var sampleConfig = `
-  ## Maximum time to suppress output
-  dedup_interval = "600s"
-`
-
 type Dedup struct {
 	DedupInterval config.Duration `toml:"dedup_interval"`
 	FlushTime     time.Time
 	Cache         map[uint64]telegraf.Metric
 }
 
-func (d *Dedup) SampleConfig() string {
-	return sampleConfig
-}
-
-func (d *Dedup) Description() string {
-	return "Filter metrics with repeating field values"
-}
-
 // Remove expired items from cache
 func (d *Dedup) cleanup() {
 	// No need to cleanup cache too often. Lets save some CPU

plugins/processors/dedup/dedup_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package dedup
+
+func (d *Dedup) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/defaults/README.md

@@ -15,8 +15,15 @@ Telegraf minimum version: Telegraf 1.15.0
 ```toml
 ## Set default fields on your metric(s) when they are nil or empty
 [[processors.defaults]]
-
-## This table determines what fields will be inserted in your metric(s)
+  ## Ensures a set of fields always exists on your metric(s) with their
+  ## respective default value.
+  ## For any given field pair (key = default), if it's not set, a field
+  ## is set on the metric with the specified default.
+  ##
+  ## A field is considered not set if it is nil on the incoming metric;
+  ## or it is not nil but its value is an empty string or is a string
+  ## of one or more spaces.
+  ##   <target-field> = <value>
   [processors.defaults.fields]
     field_1 = "bar"
     time_idle = 0

plugins/processors/defaults/defaults.go

@@ -7,38 +7,12 @@ import (
 	"github.com/influxdata/telegraf/plugins/processors"
 )
 
-const sampleConfig = `
-  ## Ensures a set of fields always exists on your metric(s) with their 
-  ## respective default value.
-  ## For any given field pair (key = default), if it's not set, a field 
-  ## is set on the metric with the specified default.
-  ## 
-  ## A field is considered not set if it is nil on the incoming metric;
-  ## or it is not nil but its value is an empty string or is a string 
-  ## of one or more spaces.
-  ##   <target-field> = <value>
-  # [processors.defaults.fields]
-  #   field_1 = "bar"
-  #   time_idle = 0
-  #   is_error = true
-`
-
 // Defaults is a processor for ensuring certain fields always exist
 // on your Metrics with at least a default value.
 type Defaults struct {
 	DefaultFieldsSets map[string]interface{} `toml:"fields"`
 }
 
-// SampleConfig represents a sample toml config for this plugin.
-func (def *Defaults) SampleConfig() string {
-	return sampleConfig
-}
-
-// Description is a brief description of this processor plugin's behaviour.
-func (def *Defaults) Description() string {
-	return "Defaults sets default value(s) for specified fields that are not set on incoming metrics."
-}
-
 // Apply contains the main implementation of this processor.
 // For each metric in 'inputMetrics', it goes over each default pair.
 // If the field in the pair does not exist on the metric, the associated default is added.

plugins/processors/defaults/defaults_sample_config.go

@@ -0,0 +1,8 @@
+//go:generate go run ../../../tools/generate_plugindata/main.go
+//go:generate go run ../../../tools/generate_plugindata/main.go --clean
+// DON'T EDIT; This file is used as a template by tools/generate_plugindata
+package defaults
+
+func (def *Defaults) SampleConfig() string {
+	return `{{ .SampleConfig }}`
+}

plugins/processors/enum/README.md

@@ -12,6 +12,7 @@ source tag or field is overwritten.
 ## Configuration
 
 ```toml
+# Map enum values according to given table.
 [[processors.enum]]
   [[processors.enum.mapping]]
     ## Name of the field to map. Globs accepted.