model

package
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 Go to latest Published: Aug 4, 2018 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Overview

Package model contains common data structures that are shared across Prometheus componenets and libraries.

Index

Constants

View Source 
const (
	// AlertNameLabel is the name of the label containing the an alert's name.
	AlertNameLabel = "alertname"

	// ExportedLabelPrefix is the prefix to prepend to the label names present in
	// exported metrics if a label of the same name is added by the server.
	ExportedLabelPrefix = "exported_"

	// MetricNameLabel is the label name indicating the metric name of a
	// timeseries.
	MetricNameLabel = "__name__"

	// SchemeLabel is the name of the label that holds the scheme on which to
	// scrape a target.
	SchemeLabel = "__scheme__"

	// AddressLabel is the name of the label that holds the address of
	// a scrape target.
	AddressLabel = "__address__"

	// MetricsPathLabel is the name of the label that holds the path on which to
	// scrape a target.
	MetricsPathLabel = "__metrics_path__"

	// ReservedLabelPrefix is a prefix which is not legal in user-supplied
	// label names.
	ReservedLabelPrefix = "__"

	// MetaLabelPrefix is a prefix for labels that provide meta information.
	// Labels with this prefix are used for intermediate label processing and
	// will not be attached to time series.
	MetaLabelPrefix = "__meta_"

	// TmpLabelPrefix is a prefix for temporary labels as part of relabelling.
	// Labels with this prefix are used for intermediate label processing and
	// will not be attached to time series. This is reserved for use in
	// Prometheus configuration files by users.
	TmpLabelPrefix = "__tmp_"

	// ParamLabelPrefix is a prefix for labels that provide URL parameters
	// used to scrape a target.
	ParamLabelPrefix = "__param_"

	// JobLabel is the label name indicating the job from which a timeseries
	// was scraped.
	JobLabel = "job"

	// InstanceLabel is the label name used for the instance label.
	InstanceLabel = "instance"

	// BucketLabel is used for the label that defines the upper bound of a
	// bucket of a histogram ("le" -> "less or equal").
	BucketLabel = "le"

	// QuantileLabel is used for the label that defines the quantile in a
	// summary.
	QuantileLabel = "quantile"
)
View Source 
const (

	// Earliest is the earliest Time representable. Handy for
	// initializing a high watermark.
	Earliest = Time(math.MinInt64)
	// Latest is the latest Time representable. Handy for initializing
	// a low watermark.
	Latest = Time(math.MaxInt64)
)
View Source 
const SeparatorByte byte = 255

SeparatorByte is a byte that cannot occur in valid UTF-8 sequences and is used to separate label names, label values, and other strings from each other when calculating their combined hash value (aka signature aka fingerprint).

Variables

View Source 
var LabelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")

LabelNameRE is a regular expression matching valid label names.

Functions

func LabelsToSignature 

func LabelsToSignature(labels map[string]string) uint64

LabelsToSignature returns a quasi-unique signature (i.e., fingerprint) for a given label set. (Collisions are possible but unlikely if the number of label sets the function is applied to is small.)

func SignatureForLabels 

func SignatureForLabels(m Metric, labels ...LabelName) uint64

SignatureForLabels works like LabelsToSignature but takes a Metric as parameter (rather than a label map) and only includes the labels with the specified LabelNames into the signature calculation. The labels passed in will be sorted by this function.

func SignatureWithoutLabels 

func SignatureWithoutLabels(m Metric, labels map[LabelName]struct{}) uint64

SignatureWithoutLabels works like LabelsToSignature but takes a Metric as parameter (rather than a label map) and excludes the labels with any of the specified LabelNames from the signature calculation.

Types

type Duration 

type Duration time.Duration

Duration wraps time.Duration. It is used to parse the custom duration format from YAML. This type should not propagate beyond the scope of input/output processing.

func ParseDuration 

func ParseDuration(durationStr string) (Duration, error)

StringToDuration parses a string into a time.Duration, assuming that a year a day always has 24h.

func (Duration) MarshalYAML 

func (d Duration) MarshalYAML() (interface{}, error)

MarshalYAML implements the yaml.Marshaler interface.

func (Duration) String 

func (d Duration) String() string

func (*Duration) UnmarshalYAML 

func (d *Duration) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements the yaml.Unmarshaler interface.

type Fingerprint 

type Fingerprint uint64

Fingerprint provides a hash-capable representation of a Metric. For our purposes, FNV-1A 64-bit is used.

func FingerprintFromString 

func FingerprintFromString(s string) (Fingerprint, error)

FingerprintFromString transforms a string representation into a Fingerprint.

func ParseFingerprint 

func ParseFingerprint(s string) (Fingerprint, error)

ParseFingerprint parses the input string into a fingerprint.

func (Fingerprint) String 

func (f Fingerprint) String() string

type FingerprintSet 

type FingerprintSet map[Fingerprint]struct{}

FingerprintSet is a set of Fingerprints.

func (FingerprintSet) Equal 

func (s FingerprintSet) Equal(o FingerprintSet) bool

Equal returns true if both sets contain the same elements (and not more).

func (FingerprintSet) Intersection 

func (s FingerprintSet) Intersection(o FingerprintSet) FingerprintSet

Intersection returns the elements contained in both sets.

type Fingerprints 

type Fingerprints []Fingerprint

Fingerprints represents a collection of Fingerprint subject to a given natural sorting scheme. It implements sort.Interface.

func (Fingerprints) Len 

func (f Fingerprints) Len() int

Len implements sort.Interface.

func (Fingerprints) Less 

func (f Fingerprints) Less(i, j int) bool

Less implements sort.Interface.

func (Fingerprints) Swap 

func (f Fingerprints) Swap(i, j int)

Swap implements sort.Interface.

type Interval 

type Interval struct {
	Start, End Time
}

Interval describes and interval between two timestamps.

type LabelName 

type LabelName string

A LabelName is a key for a LabelSet or Metric. It has a value associated therewith.

func (*LabelName) UnmarshalJSON 

func (ln *LabelName) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the json.Unmarshaler interface.

func (*LabelName) UnmarshalYAML 

func (ln *LabelName) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements the yaml.Unmarshaler interface.

type LabelNames 

type LabelNames []LabelName

LabelNames is a sortable LabelName slice. In implements sort.Interface.

func (LabelNames) Len 

func (l LabelNames) Len() int

func (LabelNames) Less 

func (l LabelNames) Less(i, j int) bool

func (LabelNames) String 

func (l LabelNames) String() string

func (LabelNames) Swap 

func (l LabelNames) Swap(i, j int)

type LabelPair 

type LabelPair struct {
	Name  LabelName
	Value LabelValue
}

LabelPair pairs a name with a value.

type LabelPairs 

type LabelPairs []*LabelPair

LabelPairs is a sortable slice of LabelPair pointers. It implements sort.Interface.

func (LabelPairs) Len 

func (l LabelPairs) Len() int

func (LabelPairs) Less 

func (l LabelPairs) Less(i, j int) bool

func (LabelPairs) Swap 

func (l LabelPairs) Swap(i, j int)

type LabelSet 

type LabelSet map[LabelName]LabelValue

A LabelSet is a collection of LabelName and LabelValue pairs. The LabelSet may be fully-qualified down to the point where it may resolve to a single Metric in the data store or not. All operations that occur within the realm of a LabelSet can emit a vector of Metric entities to which the LabelSet may match.

func (LabelSet) Before 

func (ls LabelSet) Before(o LabelSet) bool

Before compares the metrics, using the following criteria:

If m has fewer labels than o, it is before o. If it has more, it is not.

If the number of labels is the same, the superset of all label names is sorted alphanumerically. The first differing label pair found in that order determines the outcome: If the label does not exist at all in m, then m is before o, and vice versa. Otherwise the label value is compared alphanumerically.

If m and o are equal, the method returns false.

func (LabelSet) Clone 

func (ls LabelSet) Clone() LabelSet

func (LabelSet) Equal 

func (ls LabelSet) Equal(o LabelSet) bool

func (LabelSet) FastFingerprint 

func (ls LabelSet) FastFingerprint() Fingerprint

FastFingerprint returns the LabelSet's Fingerprint calculated by a faster hashing algorithm, which is, however, more susceptible to hash collisions.

func (LabelSet) Fingerprint 

func (ls LabelSet) Fingerprint() Fingerprint

Fingerprint returns the LabelSet's fingerprint.

func (LabelSet) Merge 

func (l LabelSet) Merge(other LabelSet) LabelSet

Merge is a helper function to non-destructively merge two label sets.

func (LabelSet) String 

func (l LabelSet) String() string

func (*LabelSet) UnmarshalJSON 

func (l *LabelSet) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the json.Unmarshaler interface.

type LabelValue 

type LabelValue string

A LabelValue is an associated value for a LabelName.

type LabelValues 

type LabelValues []LabelValue

LabelValues is a sortable LabelValue slice. It implements sort.Interface.

func (LabelValues) Len 

func (l LabelValues) Len() int

func (LabelValues) Less 

func (l LabelValues) Less(i, j int) bool

func (LabelValues) Swap 

func (l LabelValues) Swap(i, j int)

type Matrix 

type Matrix []*SampleStream

Matrix is a list of time series.

func (Matrix) Len 

func (m Matrix) Len() int

func (Matrix) Less 

func (m Matrix) Less(i, j int) bool

func (Matrix) String 

func (mat Matrix) String() string

func (Matrix) Swap 

func (m Matrix) Swap(i, j int)

func (Matrix) Type 

func (Matrix) Type() ValueType

type Metric 

type Metric LabelSet

A Metric is similar to a LabelSet, but the key difference is that a Metric is a singleton and refers to one and only one stream of samples.

func (Metric) Before 

func (m Metric) Before(o Metric) bool

Before compares the metrics' underlying label sets.

func (Metric) Clone 

func (m Metric) Clone() Metric

Clone returns a copy of the Metric.

func (Metric) Equal 

func (m Metric) Equal(o Metric) bool

Equal compares the metrics.

func (Metric) FastFingerprint 

func (m Metric) FastFingerprint() Fingerprint

FastFingerprint returns a Metric's Fingerprint calculated by a faster hashing algorithm, which is, however, more susceptible to hash collisions.

func (Metric) Fingerprint 

func (m Metric) Fingerprint() Fingerprint

Fingerprint returns a Metric's Fingerprint.

func (Metric) String 

func (m Metric) String() string

type Sample 

type Sample struct {
	Metric    Metric      `json:"metric"`
	Value     SampleValue `json:"value"`
	Timestamp Time        `json:"timestamp"`
}

Sample is a sample pair associated with a metric.

func (*Sample) Equal 

func (s *Sample) Equal(o *Sample) bool

Equal compares first the metrics, then the timestamp, then the value.

func (Sample) MarshalJSON 

func (s Sample) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (Sample) String 

func (s Sample) String() string

func (*Sample) UnmarshalJSON 

func (s *Sample) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

type SamplePair 

type SamplePair struct {
	Timestamp Time
	Value     SampleValue
}

SamplePair pairs a SampleValue with a Timestamp.

func (*SamplePair) Equal 

func (s *SamplePair) Equal(o *SamplePair) bool

Equal returns true if this SamplePair and o have equal Values and equal Timestamps.

func (SamplePair) MarshalJSON 

func (s SamplePair) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (SamplePair) String 

func (s SamplePair) String() string

func (*SamplePair) UnmarshalJSON 

func (s *SamplePair) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

type SampleStream 

type SampleStream struct {
	Metric Metric       `json:"metric"`
	Values []SamplePair `json:"values"`
}

SampleStream is a stream of Values belonging to an attached COWMetric.

func (SampleStream) String 

func (ss SampleStream) String() string

type SampleValue 

type SampleValue float64

A SampleValue is a representation of a value for a given sample at a given time.

func (SampleValue) Equal 

func (v SampleValue) Equal(o SampleValue) bool

func (SampleValue) MarshalJSON 

func (v SampleValue) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (SampleValue) String 

func (v SampleValue) String() string

func (*SampleValue) UnmarshalJSON 

func (v *SampleValue) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

type Samples 

type Samples []*Sample

Samples is a sortable Sample slice. It implements sort.Interface.

func (Samples) Equal 

func (s Samples) Equal(o Samples) bool

Equal compares two sets of samples and returns true if they are equal.

func (Samples) Len 

func (s Samples) Len() int

func (Samples) Less 

func (s Samples) Less(i, j int) bool

Less compares first the metrics, then the timestamp.

func (Samples) Swap 

func (s Samples) Swap(i, j int)

type Scalar 

type Scalar struct {
	Value     SampleValue `json:"value"`
	Timestamp Time        `json:"timestamp"`
}

Scalar is a scalar value evaluated at the set timestamp.

func (Scalar) MarshalJSON 

func (s Scalar) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (Scalar) String 

func (s Scalar) String() string

func (*Scalar) Type 

func (*Scalar) Type() ValueType

func (*Scalar) UnmarshalJSON 

func (s *Scalar) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

type String 

type String struct {
	Value     string `json:"value"`
	Timestamp Time   `json:"timestamp"`
}

String is a string value evaluated at the set timestamp.

func (String) MarshalJSON 

func (s String) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (*String) String 

func (s *String) String() string

func (*String) Type 

func (*String) Type() ValueType

func (*String) UnmarshalJSON 

func (s *String) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

type Time 

type Time int64

Time is the number of milliseconds since the epoch (1970-01-01 00:00 UTC) excluding leap seconds.

func Now 

func Now() Time

Now returns the current time as a Time.

func TimeFromUnix 

func TimeFromUnix(t int64) Time

TimeFromUnix returns the Time equivalent to the Unix Time t provided in seconds.

func TimeFromUnixNano 

func TimeFromUnixNano(t int64) Time

TimeFromUnixNano returns the Time equivalent to the Unix Time t provided in nanoseconds.

func (Time) Add 

func (t Time) Add(d time.Duration) Time

Add returns the Time t + d.

func (Time) After 

func (t Time) After(o Time) bool

After reports whether the Time t is after o.

func (Time) Before 

func (t Time) Before(o Time) bool

Before reports whether the Time t is before o.

func (Time) Equal 

func (t Time) Equal(o Time) bool

Equal reports whether two Times represent the same instant.

func (Time) MarshalJSON 

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

MarshalJSON implements the json.Marshaler interface.

func (Time) String 

func (t Time) String() string

String returns a string representation of the Time.

func (Time) Sub 

func (t Time) Sub(o Time) time.Duration

Sub returns the Duration t - o.

func (Time) Time 

func (t Time) Time() time.Time

Time returns the time.Time representation of t.

func (Time) Unix 

func (t Time) Unix() int64

Unix returns t as a Unix time, the number of seconds elapsed since January 1, 1970 UTC.

func (Time) UnixNano 

func (t Time) UnixNano() int64

UnixNano returns t as a Unix time, the number of nanoseconds elapsed since January 1, 1970 UTC.

func (*Time) UnmarshalJSON 

func (t *Time) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the json.Unmarshaler interface.

type Value 

type Value interface {
	Type() ValueType
	String() string
}

Value is a generic interface for values resulting from a query evaluation.

type ValueType 

type ValueType int
const (
	ValNone ValueType = iota
	ValScalar
	ValVector
	ValMatrix
	ValString
)

func (ValueType) MarshalJSON 

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

MarshalJSON implements json.Marshaler.

func (ValueType) String 

func (e ValueType) String() string

func (*ValueType) UnmarshalJSON 

func (et *ValueType) UnmarshalJSON(b []byte) error

type Vector 

type Vector []*Sample

Vector is basically only an alias for Samples, but the contract is that in a Vector, all Samples have the same timestamp.

func (Vector) Equal 

func (vec Vector) Equal(o Vector) bool

Equal compares two sets of samples and returns true if they are equal.

func (Vector) Len 

func (vec Vector) Len() int

func (Vector) Less 

func (vec Vector) Less(i, j int) bool

Less compares first the metrics, then the timestamp.

func (Vector) String 

func (vec Vector) String() string

func (Vector) Swap 

func (vec Vector) Swap(i, j int)

func (Vector) Type 

func (Vector) Type() ValueType

Source Files

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