metrics

package
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 Go to latest Published: Nov 29, 2023 License: AGPL-3.0 Imports: 20 Imported by: 0

Documentation

Overview

Package metrics contains various k6 components that deal with metrics and thresholds.

Index

Constants

View Source 
const (
	VUsName               = "vus" //nolint:revive
	VUsMaxName            = "vus_max"
	IterationsName        = "iterations"
	IterationDurationName = "iteration_duration"
	DroppedIterationsName = "dropped_iterations"

	ChecksName        = "checks"
	GroupDurationName = "group_duration"

	HTTPReqsName              = "http_reqs"
	HTTPReqFailedName         = "http_req_failed"
	HTTPReqDurationName       = "http_req_duration"
	HTTPReqBlockedName        = "http_req_blocked"
	HTTPReqConnectingName     = "http_req_connecting"
	HTTPReqTLSHandshakingName = "http_req_tls_handshaking"
	HTTPReqSendingName        = "http_req_sending"
	HTTPReqWaitingName        = "http_req_waiting"
	HTTPReqReceivingName      = "http_req_receiving"

	WSSessionsName         = "ws_sessions"
	WSMessagesSentName     = "ws_msgs_sent"
	WSMessagesReceivedName = "ws_msgs_received"
	WSPingName             = "ws_ping"
	WSSessionDurationName  = "ws_session_duration"
	WSConnectingName       = "ws_connecting"

	GRPCReqDurationName = "grpc_req_duration"

	DataSentName     = "data_sent"
	DataReceivedName = "data_received"
)
View Source 
const (
	Counter = MetricType(iota) // A counter that sums its data points
	Gauge                      // A gauge that displays the latest value
	Trend                      // A trend, min/max/avg/med are interesting
	Rate                       // A rate, displays % of values that aren't 0
)

Possible values for MetricType.

View Source 
const (
	Default = ValueType(iota) // Values are presented as-is
	Time                      // Values are time durations (milliseconds)
	Data                      // Values are data amounts (bytes)
)

Possible values for ValueType.

Variables

View Source 
var DefaultSystemTagSet = SystemTagSet(
	TagProto | TagSubproto | TagStatus | TagMethod | TagURL | TagName | TagGroup |
		TagCheck | TagError | TagErrorCode | TagTLSVersion | TagScenario | TagService | TagExpectedResponse)

DefaultSystemTagSet includes all of the system tags emitted with metrics by default. Other tags that are not enabled by default include: iter, vu, ocsp_status, ip

View Source 
var ErrInvalidMetricType = errors.New("invalid metric type")

ErrInvalidMetricType indicates the serialized metric type is invalid.

View Source 
var ErrInvalidThreshold = errors.New("invalid threshold")

ErrInvalidThreshold indicates a threshold is not valid

View Source 
var ErrInvalidValueType = errors.New("invalid value type")

ErrInvalidValueType indicates the serialized value type is invalid.

View Source 
var ErrMetricNameParsing = errors.New("parsing metric name failed")

ErrMetricNameParsing indicates parsing a metric name failed

View Source 
var NonIndexableSystemTags = SystemTagSet(TagIter | TagVU)

NonIndexableSystemTags are high cardinality system tags (i.e. metadata).

Functions

func B 

func B(b bool) float64

B formats a boolean value for emission.

func D 

func D(d time.Duration) float64

D formats a duration for emission. The reverse of D() is ToD().

func GetResolversForTrendColumns 

func GetResolversForTrendColumns(trendColumns []string) (map[string]func(s *TrendSink) float64, error)

GetResolversForTrendColumns checks if passed trend columns are valid for use in the summary output and then returns a map of the corresponding resolvers.

func MarshalJSONWithoutHTMLEscape 

func MarshalJSONWithoutHTMLEscape(t interface{}) ([]byte, error)

MarshalJSONWithoutHTMLEscape marshals t to JSON without escaping characters for safe use in HTML.

func ParseMetricName 

func ParseMetricName(name string) (string, []string, error)

ParseMetricName parses a metric name expression of the form metric_name{tag_key:tag_value,...} Its first return value is the parsed metric name, second are parsed tags as as slice of "key:value" strings. On failure, it returns an error containing the `ErrMetricNameParsing` in its chain.

func PushIfNotDone 

func PushIfNotDone(ctx context.Context, output chan<- SampleContainer, sample SampleContainer) bool

PushIfNotDone first checks if the supplied context is done and doesn't push the sample container if it is.

func ToD 

func ToD(d float64) time.Duration

ToD converts an emitted duration to a time.Duration. The reverse of ToD() is D().

Types

type BuiltinMetrics 

type BuiltinMetrics struct {
	VUs               *Metric
	VUsMax            *Metric
	Iterations        *Metric
	IterationDuration *Metric
	DroppedIterations *Metric

	// Runner-emitted.
	Checks        *Metric
	GroupDuration *Metric

	// HTTP-related.
	HTTPReqs              *Metric
	HTTPReqFailed         *Metric
	HTTPReqDuration       *Metric
	HTTPReqBlocked        *Metric
	HTTPReqConnecting     *Metric
	HTTPReqTLSHandshaking *Metric
	HTTPReqSending        *Metric
	HTTPReqWaiting        *Metric
	HTTPReqReceiving      *Metric

	// Websocket-related
	WSSessions         *Metric
	WSMessagesSent     *Metric
	WSMessagesReceived *Metric
	WSPing             *Metric
	WSSessionDuration  *Metric
	WSConnecting       *Metric

	// gRPC-related
	GRPCReqDuration *Metric

	// Network-related; used for future protocols as well.
	DataSent     *Metric
	DataReceived *Metric
}

BuiltinMetrics represent all the builtin metrics of k6

func RegisterBuiltinMetrics 

func RegisterBuiltinMetrics(registry *Registry) *BuiltinMetrics

RegisterBuiltinMetrics register and returns the builtin metrics in the provided registry

type ConnectedSampleContainer 

type ConnectedSampleContainer interface {
	SampleContainer
	GetTags() *TagSet
	GetTime() time.Time
}

ConnectedSampleContainer is an extension of the SampleContainer interface that should be implemented when emitted samples are connected and share the same time and tags.

type ConnectedSamples 

type ConnectedSamples struct {
	Samples []Sample
	Tags    *TagSet
	Time    time.Time
}

ConnectedSamples is the simplest ConnectedSampleContainer implementation that will be used when there's no need for extra information

func (ConnectedSamples) GetSamples 

func (cs ConnectedSamples) GetSamples() []Sample

GetSamples implements the SampleContainer and ConnectedSampleContainer interfaces and returns the stored slice with samples.

func (ConnectedSamples) GetTags 

func (cs ConnectedSamples) GetTags() *TagSet

GetTags implements ConnectedSampleContainer interface and returns stored tags.

func (ConnectedSamples) GetTime 

func (cs ConnectedSamples) GetTime() time.Time

GetTime implements ConnectedSampleContainer interface and returns stored time.

type CounterSink 

type CounterSink struct {
	Value float64
	First time.Time
}

func (*CounterSink) Add 

func (c *CounterSink) Add(s Sample)

func (*CounterSink) Format 

func (c *CounterSink) Format(t time.Duration) map[string]float64

func (*CounterSink) IsEmpty 

func (c *CounterSink) IsEmpty() bool

IsEmpty indicates whether the CounterSink is empty.

type EnabledTags 

type EnabledTags map[string]bool

EnabledTags is a string to bool map (for lookup efficiency) that is used to keep track of which system tags and non-system tags to include.

TODO: move to types.StringSet or something like that, this isn't metrics specific

func (*EnabledTags) MarshalJSON 

func (i *EnabledTags) MarshalJSON() ([]byte, error)

MarshalJSON converts the EnabledTags to a list (JS array).

func (*EnabledTags) UnmarshalJSON 

func (i *EnabledTags) UnmarshalJSON(data []byte) error

UnmarshalJSON converts the tag list back to expected tag set.

func (*EnabledTags) UnmarshalText 

func (i *EnabledTags) UnmarshalText(data []byte) error

UnmarshalText converts the tag list to EnabledTags.

type GaugeSink 

type GaugeSink struct {
	Value    float64
	Max, Min float64
	// contains filtered or unexported fields
}

func (*GaugeSink) Add 

func (g *GaugeSink) Add(s Sample)

func (*GaugeSink) Format 

func (g *GaugeSink) Format(t time.Duration) map[string]float64

func (*GaugeSink) IsEmpty 

func (g *GaugeSink) IsEmpty() bool

IsEmpty indicates whether the GaugeSink is empty.

type Metric 

type Metric struct {
	Name     string     `json:"name"`
	Type     MetricType `json:"type"`
	Contains ValueType  `json:"contains"`

	// TODO: decouple the metrics from the sinks and thresholds... have them
	// linked, but not in the same struct?
	Tainted    null.Bool    `json:"tainted"`
	Thresholds Thresholds   `json:"thresholds"`
	Submetrics []*Submetric `json:"submetrics"`
	Sub        *Submetric   `json:"-"`
	Sink       Sink         `json:"-"`
	Observed   bool         `json:"-"`
	// contains filtered or unexported fields
}

A Metric defines the shape of a set of data.

func (*Metric) AddSubmetric 

func (m *Metric) AddSubmetric(keyValues string) (*Submetric, error)

AddSubmetric creates a new submetric from the key:value threshold definition and adds it to the metric's submetrics list.

type MetricType 

type MetricType int

A MetricType specifies the type of a metric.

func (MetricType) MarshalJSON 

func (t MetricType) MarshalJSON() ([]byte, error)

MarshalJSON serializes a MetricType as a human readable string.

func (MetricType) MarshalText 

func (t MetricType) MarshalText() ([]byte, error)

MarshalText serializes a MetricType as a human readable string.

func (MetricType) String 

func (t MetricType) String() string

func (*MetricType) UnmarshalText 

func (t *MetricType) UnmarshalText(data []byte) error

UnmarshalText deserializes a MetricType from a string representation.

type RateSink 

type RateSink struct {
	Trues int64
	Total int64
}

func (*RateSink) Add 

func (r *RateSink) Add(s Sample)

func (RateSink) Format 

func (r RateSink) Format(t time.Duration) map[string]float64

func (*RateSink) IsEmpty 

func (r *RateSink) IsEmpty() bool

IsEmpty indicates whether the RateSink is empty.

type Registry 

type Registry struct {
	// contains filtered or unexported fields
}

Registry is what can create metrics

func NewRegistry 

func NewRegistry() *Registry

NewRegistry returns a new registry

func (*Registry) All 

func (r *Registry) All() []*Metric

All returns all the registered metrics.

func (*Registry) Get 

func (r *Registry) Get(name string) *Metric

Get returns the Metric with the given name. If that metric doesn't exist, Get() will return a nil value.

func (*Registry) MustNewMetric 

func (r *Registry) MustNewMetric(name string, typ MetricType, t ...ValueType) *Metric

MustNewMetric is like NewMetric, but will panic if there is an error

func (*Registry) NewMetric 

func (r *Registry) NewMetric(name string, typ MetricType, t ...ValueType) (*Metric, error)

NewMetric returns new metric registered to this registry TODO have multiple versions returning specific metric types when we have such things

func (*Registry) RootTagSet 

func (r *Registry) RootTagSet() *TagSet

RootTagSet is the empty root set that all other TagSets must originate from.

type Sample 

type Sample struct {
	TimeSeries
	Time  time.Time
	Value float64

	// Optional high-cardinality metadata that won't be indexed in atlas.
	//
	// It can be nil if it wasn't explicitly specified, reduce memory
	// allocations and GC overhead.
	Metadata map[string]string
}

A Sample is a single metric measurement at a specific point in time. It can have two sets of string key=value metadata:

  • indexed Tags for low-cardinality data that are part of the TimeSeries
  • optional non-indexed Metadata that are meant for high-cardinality information

func (Sample) GetSamples 

func (s Sample) GetSamples() []Sample

GetSamples implement the ConnectedSampleContainer interface for a single Sample, since it's obviously connected with itself :)

func (Sample) GetTags 

func (s Sample) GetTags() *TagSet

GetTags implements ConnectedSampleContainer interface and returns the sample's tags.

func (Sample) GetTime 

func (s Sample) GetTime() time.Time

GetTime just implements ConnectedSampleContainer interface and returns the sample's time.

type SampleContainer 

type SampleContainer interface {
	GetSamples() []Sample
}

SampleContainer is a simple abstraction that allows sample producers to attach extra information to samples they return

func GetBufferedSamples 

func GetBufferedSamples(input <-chan SampleContainer) (result []SampleContainer)

GetBufferedSamples will read all present (i.e. buffered or currently being pushed) values in the input channel and return them as a slice.

type Samples 

type Samples []Sample

Samples is just the simplest SampleContainer implementation that will be used when there's no need for extra information

func (Samples) GetSamples 

func (s Samples) GetSamples() []Sample

GetSamples just implements the SampleContainer interface

type Sink 

type Sink interface {
	Add(s Sample)                              // Add a sample to the sink.
	Format(t time.Duration) map[string]float64 // Data for thresholds.
	IsEmpty() bool                             // Check if the Sink is empty.
}

func NewSink 

func NewSink(mt MetricType) Sink

NewSink creates the related Sink for the provided MetricType.

type Submetric 

type Submetric struct {
	Name   string  `json:"name"`
	Suffix string  `json:"suffix"` // TODO: rename?
	Tags   *TagSet `json:"tags"`

	Metric *Metric `json:"-"`
	Parent *Metric `json:"-"`
}

A Submetric represents a filtered dataset based on a parent metric.

type SystemTag 

type SystemTag uint32

SystemTag values are bit-shifted identifiers of all of the various system tags that k6 has. 

const (
	TagProto SystemTag = 1 << iota
	TagSubproto
	TagStatus
	TagMethod
	TagURL
	TagName
	TagGroup
	TagCheck
	TagError
	TagErrorCode
	TagTLSVersion
	TagScenario
	TagService
	TagExpectedResponse

	// System tags not enabled by default.
	TagIter // non-indexable
	TagVU   // non-indexable
	TagOCSPStatus
	TagIP
)

Default system tags includes all of the system tags emitted with metrics by default.

func SystemTagString 

func SystemTagString(s string) (SystemTag, error)

SystemTagString retrieves an enum value from the enum constants string name. Throws an error if the param is not part of the enum.

func SystemTagValues 

func SystemTagValues() []SystemTag

SystemTagValues returns all values of the enum

func (SystemTag) IsASystemTag 

func (i SystemTag) IsASystemTag() bool

IsASystemTag returns "true" if the value is listed in the enum definition. "false" otherwise

func (SystemTag) String 

func (i SystemTag) String() string

type SystemTagSet 

type SystemTagSet SystemTag

SystemTagSet is a bitmask that is used to keep track which system tags should be included in metric Samples.

func NewSystemTagSet 

func NewSystemTagSet(tags ...SystemTag) *SystemTagSet

NewSystemTagSet returns a SystemTagSet from input.

func ToSystemTagSet 

func ToSystemTagSet(tags []string) *SystemTagSet

ToSystemTagSet converts list of tags to SystemTagSet TODO: emit error instead of discarding invalid values.

func (*SystemTagSet) Add 

func (i *SystemTagSet) Add(tag SystemTag)

Add adds a tag to tag set.

func (*SystemTagSet) Has 

func (i *SystemTagSet) Has(tag SystemTag) bool

Has checks a tag included in tag set.

func (SystemTagSet) Map 

func (i SystemTagSet) Map() EnabledTags

Map returns the EnabledTags with current value from SystemTagSet

func (*SystemTagSet) MarshalJSON 

func (i *SystemTagSet) MarshalJSON() ([]byte, error)

MarshalJSON converts the SystemTagSet to a list (JS array).

func (SystemTagSet) SetString 

func (i SystemTagSet) SetString() string

SetString returns comma separated list of the string representation of all values in the set

func (*SystemTagSet) UnmarshalJSON 

func (i *SystemTagSet) UnmarshalJSON(data []byte) error

UnmarshalJSON converts the tag list back to expected tag set.

func (*SystemTagSet) UnmarshalText 

func (i *SystemTagSet) UnmarshalText(data []byte) error

UnmarshalText converts the tag list to SystemTagSet.

type TagSet 

type TagSet atlas.Node

A TagSet represents an immutable set of metric tags. For the efficient and thread-safe storage of the key=value tag pairs, it uses the https://github.com/mstoykov/atlas data structure.

Assuming all tag sets start from the same root (see Registry.RootTagSet()), you can compare *TagSet values of different metric Samples with the `==` Go operator to check if they have the same tags, and you can also use *TagSet values for map indexes and caching.

See also the TimeSeries type for comparing a Sample's {metric+tags} for equality at the same time.

func (*TagSet) Contains 

func (ts *TagSet) Contains(other *TagSet) bool

Contains checks that each key=value tag pair in the provided TagSet exists in the receiver tag set as well, i.e. that the given set is a sub-set of it.

func (*TagSet) Get 

func (ts *TagSet) Get(name string) (string, bool)

Get returns the value of the tag with the given name and true, if that tag exists in the set, and an empty string and false otherwise.

func (*TagSet) IsEmpty 

func (ts *TagSet) IsEmpty() bool

IsEmpty checks if the tag set is empty, i.e. if it's the root atlas node.

func (*TagSet) Map 

func (ts *TagSet) Map() map[string]string

Map returns a {key: value} string map with all of the tags in the set.

func (*TagSet) MarshalEasyJSON 

func (ts *TagSet) MarshalEasyJSON(w *jwriter.Writer)

MarshalEasyJSON supports easyjson.Marshaler interface for better performance.

func (*TagSet) MarshalJSON 

func (ts *TagSet) MarshalJSON() ([]byte, error)

MarshalJSON serializes the tags to a JSON string.

func (*TagSet) UnmarshalEasyJSON 

func (ts *TagSet) UnmarshalEasyJSON(l *jlexer.Lexer)

UnmarshalEasyJSON WILL ALWAYS RETURN AN ERROR because a TagSet needs to be started from a common atlas root. This function exists to prevent any automatic reflection-based attempts at unmarshaling.

func (*TagSet) UnmarshalJSON 

func (ts *TagSet) UnmarshalJSON([]byte) error

UnmarshalJSON WILL ALWAYS RETURN AN ERROR because a TagSet needs to be started from a common atlas root. This function exists to prevent any automatic reflection-based attempts at unmarshaling.

func (*TagSet) With 

func (ts *TagSet) With(name, value string) *TagSet

With returns another TagSet object that contains the combination of the current receiver tags and the name=value tag from its parameters.

It doesn't modify the receiver, it will either return an already existing TagSet with these tags, if it exists, or create a new TagSet with them and return it.

If a tag with the specified name already exists in the set, it will be overwritten with the new value in the returned set.

func (*TagSet) WithTagsFromMap 

func (ts *TagSet) WithTagsFromMap(m map[string]string) *TagSet

WithTagsFromMap sorts the given tags by their keys and adds them to the current tag set one by one, without branching out. This is generally discouraged and sequential usage of the TagSet.With() method should be preferred and used in a consistent sequence, whenever possible.

The only place this method should be used is if we already have a map[string]string of tags, e.g. with the test-wide --tags from the root, with scenario.tags, with custom per-request tags from a user, etc. Then it's more efficient to sort their keys before we add them. If we don't, go map iteration happens in pseudo-random order and this will generate a lot of useless dead-end atlas Nodes on multiple TagSet accretions.

func (*TagSet) Without 

func (ts *TagSet) Without(name string) *TagSet

Without returns another TagSet object that contains all of the tags from the existing TagSet except the one with the given key.

It doesn't modify the receiver, it will either return an already existing TagSet with these tags, if it exists, or create a new TagSet with them and return it.

If a tag with the specified name doesn't exist in the set, it will return the receiver.

type TagsAndMeta 

type TagsAndMeta struct {
	Tags     *TagSet
	Metadata map[string]string // could be nil
}

TagsAndMeta is a helper type that provides easy group manipulation of the indexed Tags and the non-indexed Metadata values together. While both of them are part of a metric Sample, the TagsAndMeta type isn't used there because the Tags participate in the Sample's TimeSeries and the Metadata does not.

Instead, this type is mostly used by the VU and JS code while it assembles the final consolidated Tags and Metadata values to put in the Sample.

IMPORTANT: this data structure is not thread safe! The methods of the lib.VUStateTags type are where the synchronization happens.

func (TagsAndMeta) Clone 

func (tm TagsAndMeta) Clone() TagsAndMeta

Clone makes a complete copy of the current TagsAndMeta object and returns it.

func (*TagsAndMeta) DeleteMetadata 

func (tm *TagsAndMeta) DeleteMetadata(key string)

DeleteMetadata removes the given key from metadata.

func (*TagsAndMeta) DeleteTag 

func (tm *TagsAndMeta) DeleteTag(key string)

DeleteTag removes the given key from tags.

func (*TagsAndMeta) SetMetadata 

func (tm *TagsAndMeta) SetMetadata(key, value string)

SetMetadata adds the given key=value datum to the Metadata.

func (*TagsAndMeta) SetSystemTagOrMeta 

func (tm *TagsAndMeta) SetSystemTagOrMeta(tag SystemTag, value string)

SetSystemTagOrMeta automatically adds the system tag either as an indexed tag or an unindexed one (metadata), based on the NonIndexableSystemTags set.

func (*TagsAndMeta) SetSystemTagOrMetaIfEnabled 

func (tm *TagsAndMeta) SetSystemTagOrMetaIfEnabled(enabledSystemTags *SystemTagSet, tag SystemTag, value string)

SetSystemTagOrMetaIfEnabled checks if the supplied SystemTag is enabled in this test run (i.e. is in the SystemTagSet) and passes it to SetSystemTagOrMeta() if it is.

func (*TagsAndMeta) SetTag 

func (tm *TagsAndMeta) SetTag(key, value string)

SetTag adds the given key=value tag to the Tags.

type Threshold 

type Threshold struct {
	// Source is the text based source of the threshold
	Source string
	// LastFailed is a marker if the last testing of this threshold failed
	LastFailed bool
	// AbortOnFail marks if a given threshold fails that the whole test should be aborted
	AbortOnFail bool
	// AbortGracePeriod is a the minimum amount of time a test should be running before a failing
	// this threshold will abort the test
	AbortGracePeriod types.NullDuration
	// contains filtered or unexported fields
}

Threshold is a representation of a single threshold for a single metric

type Thresholds 

type Thresholds struct {
	Thresholds []*Threshold
	Abort      bool
	// contains filtered or unexported fields
}

Thresholds is the combination of all Thresholds for a given metric

func NewThresholds 

func NewThresholds(sources []string) Thresholds

NewThresholds returns Thresholds objects representing the provided source strings

func (Thresholds) MarshalJSON 

func (ts Thresholds) MarshalJSON() ([]byte, error)

MarshalJSON is implementation of json.Marshaler

func (*Thresholds) Parse 

func (ts *Thresholds) Parse() error

Parse parses the Thresholds and fills each Threshold.parsed field with the result. It effectively asserts they are syntaxically correct.

func (*Thresholds) Run 

func (ts *Thresholds) Run(sink Sink, duration time.Duration) (bool, error)

Run processes all the thresholds with the provided Sink at the provided time and returns if any of them fails

func (*Thresholds) UnmarshalJSON 

func (ts *Thresholds) UnmarshalJSON(data []byte) error

UnmarshalJSON is implementation of json.Unmarshaler

func (*Thresholds) Validate 

func (ts *Thresholds) Validate(metricName string, r *Registry) error

Validate ensures a threshold definition is consistent with the metric it applies to. Given a metric registry and a metric name to apply the expressions too, Validate will assert that each threshold expression uses an aggregation method that's supported by the provided metric. It returns an error otherwise. Note that this function expects the passed in thresholds to have been parsed already, and have their Parsed (ThresholdExpression) field already filled.

type TimeSeries 

type TimeSeries struct {
	Metric *Metric
	Tags   *TagSet
}

A TimeSeries uniquely identifies the metric and the set of metric tags that a Sample (i.e. a metric measurement) has. TimeSeries objects are comparable with the == operator and can be used as map indexes.

type TrendSink 

type TrendSink struct {
	// contains filtered or unexported fields
}

func NewTrendSink 

func NewTrendSink() *TrendSink

NewTrendSink makes a Trend sink with the OpenHistogram circllhist histogram.

func (*TrendSink) Add 

func (t *TrendSink) Add(s Sample)

func (*TrendSink) Avg 

func (t *TrendSink) Avg() float64

Avg returns the average (i.e. mean) value.

func (*TrendSink) Count 

func (t *TrendSink) Count() uint64

Count returns the number of recorded values.

func (*TrendSink) Format 

func (t *TrendSink) Format(tt time.Duration) map[string]float64

func (*TrendSink) IsEmpty 

func (t *TrendSink) IsEmpty() bool

IsEmpty indicates whether the TrendSink is empty.

func (*TrendSink) Max 

func (t *TrendSink) Max() float64

Max returns the maximum value.

func (*TrendSink) Min 

func (t *TrendSink) Min() float64

Min returns the minimum value.

func (*TrendSink) P 

func (t *TrendSink) P(pct float64) float64

P calculates the given percentile from sink values.

func (*TrendSink) Total 

func (t *TrendSink) Total() float64

Total returns the total (i.e. "sum") value for all measurements.

type ValueType 

type ValueType int

ValueType holds the type of values a metric contains.

func (ValueType) MarshalJSON 

func (t ValueType) MarshalJSON() ([]byte, error)

MarshalJSON serializes a ValueType to a JSON string.

func (ValueType) MarshalText 

func (t ValueType) MarshalText() ([]byte, error)

MarshalText serializes a ValueType as a human readable string.

func (ValueType) String 

func (t ValueType) String() string

func (*ValueType) UnmarshalText 

func (t *ValueType) UnmarshalText(data []byte) error

UnmarshalText deserializes a ValueType from a string representation.

Source Files

View all Source files

Directories

Path Synopsis
Package engine contains the internal metrics engine responsible for aggregating metrics during the test and evaluating thresholds against them.
 Package engine contains the internal metrics engine responsible for aggregating metrics during the test and evaluating thresholds against them.

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