prometheus

Documentation

Index

• type Client
  • func NewClient() (*Client, error)
  • func (in *Client) API() v1.API
  • func (in *Client) Address() string
  • func (in *Client) GetAllRequestRates(namespace string, ratesInterval string) (model.Vector, error)
  • func (in *Client) GetAppRequestRates(namespace, app, ratesInterval string) (model.Vector, model.Vector, error)
  • func (in *Client) GetMetrics(query *MetricsQuery) Metrics
  • func (in *Client) GetServiceHealth(namespace, servicename string, ports []int32) (EnvoyServiceHealth, error)
  • func (in *Client) GetServiceRequestRates(namespace, service, ratesInterval string) (model.Vector, error)
  • func (in *Client) GetSourceWorkloads(namespace string, servicename string) (map[string][]Workload, error)
  • func (in *Client) GetWorkloadRequestRates(namespace, workload, ratesInterval string) (model.Vector, model.Vector, error)
  • func (in *Client) Inject(api v1.API)
• type ClientInterface
• type EnvoyRatio
• type EnvoyServiceHealth
• type Histogram
• type Metric
• type Metrics
• type MetricsQuery
  • func (q *MetricsQuery) FillDefaults()
• type Workload

Types

type Client

type Client struct {
	ClientInterface
	// contains filtered or unexported fields
}

Client for Prometheus API. It hides the way we query Prometheus offering a layer with a high level defined API.

func NewClient

func NewClient() (*Client, error)

NewClient creates a new client to the Prometheus API. It returns an error on any problem.

func (*Client) API

func (in *Client) API() v1.API

API returns the Prometheus V1 HTTP API for performing calls not supported natively by this client

func (*Client) Address

func (in *Client) Address() string

Address return the configured Prometheus service URL

func (*Client) GetAllRequestRates

func (in *Client) GetAllRequestRates(namespace string, ratesInterval string) (model.Vector, error)

GetAllRequestRates queries Prometheus to fetch request counters rates over a time interval within a namespace Returns (rates, error)

func (*Client) GetAppRequestRates

func (in *Client) GetAppRequestRates(namespace, app, ratesInterval string) (model.Vector, model.Vector, error)

GetAppRequestRates queries Prometheus to fetch request counters rates over a time interval for a given app, both in and out. Returns (in, out, error)

func (*Client) GetMetrics

func (in *Client) GetMetrics(query *MetricsQuery) Metrics

GetMetrics returns the Metrics related to the provided query options.

func (*Client) GetServiceHealth

func (in *Client) GetServiceHealth(namespace, servicename string, ports []int32) (EnvoyServiceHealth, error)

GetServiceHealth returns the Health related to the provided service identified by its namespace and service name. It reads Envoy metrics, inbound and outbound When the health is unavailable, total number of members will be 0.

func (*Client) GetServiceRequestRates

func (in *Client) GetServiceRequestRates(namespace, service, ratesInterval string) (model.Vector, error)

GetServiceRequestRates queries Prometheus to fetch request counters rates over a time interval for a given service (hence only inbound). Returns (in, error)

func (*Client) GetSourceWorkloads

func (in *Client) GetSourceWorkloads(namespace string, servicename string) (map[string][]Workload, error)

GetSourceWorkloads returns a map of list of source workloads for a given service identified by its namespace and service name. Returned map has a destination version as a key and a list of workloads as values. It returns an error on any problem.

func (*Client) GetWorkloadRequestRates

func (in *Client) GetWorkloadRequestRates(namespace, workload, ratesInterval string) (model.Vector, model.Vector, error)

GetWorkloadRequestRates queries Prometheus to fetch request counters rates over a time interval for a given workload, both in and out. Returns (in, out, error)

func (*Client) Inject

func (in *Client) Inject(api v1.API)

Inject allows for replacing the API with a mock For testing

type ClientInterface

type ClientInterface interface {
	GetServiceHealth(namespace, servicename string, ports []int32) (EnvoyServiceHealth, error)
	GetAllRequestRates(namespace, ratesInterval string) (model.Vector, error)
	GetServiceRequestRates(namespace, service, ratesInterval string) (model.Vector, error)
	GetAppRequestRates(namespace, app, ratesInterval string) (model.Vector, model.Vector, error)
	GetWorkloadRequestRates(namespace, workload, ratesInterval string) (model.Vector, model.Vector, error)
	GetSourceWorkloads(namespace, servicename string) (map[string][]Workload, error)
}

ClientInterface for mocks (only mocked function are necessary here)

type EnvoyRatio

type EnvoyRatio struct {
	Healthy int `json:"healthy"`
	Total   int `json:"total"`
}

EnvoyRatio is the number of healthy members versus total members

type EnvoyServiceHealth

type EnvoyServiceHealth struct {
	Inbound  EnvoyRatio `json:"inbound"`
	Outbound EnvoyRatio `json:"outbound"`
}

EnvoyServiceHealth is the number of healthy versus total membership (ie. replicas) inside envoy cluster for inbound and outbound traffic

type Histogram

type Histogram struct {
	Average      *Metric `json:"average"`
	Median       *Metric `json:"median"`
	Percentile95 *Metric `json:"percentile95"`
	Percentile99 *Metric `json:"percentile99"`
}

Histogram contains Metric objects for several histogram-kind statistics

type Metric

type Metric struct {
	Matrix model.Matrix `json:"matrix"`
	// contains filtered or unexported fields
}

Metric holds the Prometheus Matrix model, which contains one or more time series (depending on grouping)

type Metrics

type Metrics struct {
	Metrics    map[string]*Metric   `json:"metrics"`
	Histograms map[string]Histogram `json:"histograms"`
}

Metrics contains health, all simple metrics and histograms data

type MetricsQuery

type MetricsQuery struct {
	v1.Range
	RateInterval string
	RateFunc     string
	Filters      []string
	ByLabelsIn   []string
	ByLabelsOut  []string
	Namespace    string
	// TODO: replace with single string value when `business.GetApps` gets deleted
	Apps     []string
	Workload string
}

MetricsQuery holds query parameters for a typical metrics query

func (*MetricsQuery) FillDefaults

func (q *MetricsQuery) FillDefaults()

FillDefaults fills the struct with default parameters

type Workload

type Workload struct {
	Namespace string
	App       string
	Workload  string
	Version   string
}

Workload describes a workload with contextual information