instance

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 Go to latest Published: Mar 21, 2022 License: AGPL-3.0 Imports: 25 Imported by: 0

Documentation

Overview

This directory was copied and adapted from https://github.com/grafana/agent/tree/main/pkg/metrics. We cannot vendor the agent in since the agent vendors loki in, which would cause a cyclic dependency. NOTE: many changes have been made to the original code for our use-case.

This directory was copied and adapted from https://github.com/grafana/agent/tree/main/pkg/metrics. We cannot vendor the agent in since the agent vendors loki in, which would cause a cyclic dependency. NOTE: many changes have been made to the original code for our use-case.

This directory was copied and adapted from https://github.com/grafana/agent/tree/main/pkg/metrics. We cannot vendor the agent in since the agent vendors loki in, which would cause a cyclic dependency. NOTE: many changes have been made to the original code for our use-case.

This directory was copied and adapted from https://github.com/grafana/agent/tree/main/pkg/metrics. We cannot vendor the agent in since the agent vendors loki in, which would cause a cyclic dependency. NOTE: many changes have been made to the original code for our use-case.

This directory was copied and adapted from https://github.com/grafana/agent/tree/main/pkg/metrics. We cannot vendor the agent in since the agent vendors loki in, which would cause a cyclic dependency. NOTE: many changes have been made to the original code for our use-case.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// DefaultBasicManagerConfig is the default config for the BasicManager.
	DefaultBasicManagerConfig = BasicManagerConfig{
		InstanceRestartBackoff: 5 * time.Second,
	}
)
View Source 
var (
	DefaultConfig = Config{
		Dir:                 "ruler-wal",
		TruncateFrequency:   60 * time.Minute,
		MinAge:              5 * time.Minute,
		MaxAge:              4 * time.Hour,
		RemoteFlushDeadline: 1 * time.Minute,
	}
)

Default configuration values

Functions

func MarshalConfig 

func MarshalConfig(c *Config, scrubSecrets bool) ([]byte, error)

MarshalConfig marshals an instance config based on a provided content type.

func MarshalConfigToWriter 

func MarshalConfigToWriter(c *Config, w io.Writer, scrubSecrets bool) error

MarshalConfigToWriter marshals a config to an io.Writer.

Types

type BasicManager 

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

BasicManager creates a new BasicManager, implementing the Manager interface. BasicManager will directly launch instances and perform no extra processing.

Other implementations of Manager usually wrap a BasicManager.

func NewBasicManager 

func NewBasicManager(cfg BasicManagerConfig, metrics *Metrics, logger log.Logger, launch Factory) *BasicManager

NewBasicManager creates a new BasicManager. The launch function will be invoked any time a new Config is applied.

The lifecycle of any ManagedInstance returned by the launch function will be handled by the BasicManager. Instances will be automatically restarted if stopped, updated if the config changes, or removed when the Config is deleted.

func (*BasicManager) ApplyConfig 

func (m *BasicManager) ApplyConfig(c Config) error

ApplyConfig takes a Config and either starts a new managed instance or updates an existing managed instance. The value for Name in c is used to uniquely identify the Config and determine whether the Config has an existing associated managed instance.

func (*BasicManager) DeleteConfig 

func (m *BasicManager) DeleteConfig(name string) error

DeleteConfig removes a managed instance by its config name. Returns an error if there is no such managed instance with the given name.

func (*BasicManager) GetInstance 

func (m *BasicManager) GetInstance(name string) (ManagedInstance, error)

GetInstance returns the given instance by name.

func (*BasicManager) InstanceReady 

func (m *BasicManager) InstanceReady(name string) bool

InstanceReady indicates if an instance is ready for processing.

func (*BasicManager) ListConfigs 

func (m *BasicManager) ListConfigs() map[string]Config

ListConfigs lists the current active configs managed by BasicManager.

func (*BasicManager) ListInstances 

func (m *BasicManager) ListInstances() map[string]ManagedInstance

ListInstances returns the current active instances managed by BasicManager.

func (*BasicManager) Ready 

func (m *BasicManager) Ready() bool

Ready indicates if all instances are ready for processing.

func (*BasicManager) Stop 

func (m *BasicManager) Stop()

Stop stops the BasicManager and stops all active processes for configs.

func (*BasicManager) UpdateManagerConfig 

func (m *BasicManager) UpdateManagerConfig(c BasicManagerConfig)

UpdateManagerConfig updates the BasicManagerConfig.

type BasicManagerConfig 

type BasicManagerConfig struct {
	InstanceRestartBackoff time.Duration
}

BasicManagerConfig controls the operations of a BasicManager.

type Config 

type Config struct {
	Tenant      string
	Name        string
	RemoteWrite []*config.RemoteWriteConfig

	Dir string `yaml:"dir"`

	// How frequently the WAL should be truncated.
	TruncateFrequency time.Duration `yaml:"truncate_frequency,omitempty"`

	// Minimum and maximum time series should exist in the WAL for.
	MinAge time.Duration `yaml:"min_age,omitempty"`
	MaxAge time.Duration `yaml:"max_age,omitempty"`

	RemoteFlushDeadline time.Duration `yaml:"remote_flush_deadline,omitempty"`
}

Config is a specific agent that runs within the overall Prometheus agent. It has its own set of scrape_configs and remote_write rules.

func UnmarshalConfig 

func UnmarshalConfig(r io.Reader) (*Config, error)

UnmarshalConfig unmarshals an instance config from a reader based on a provided content type.

func (*Config) ApplyDefaults 

func (c *Config) ApplyDefaults() error

ApplyDefaults applies default configurations to the configuration to all values that have not been changed to their non-zero value. ApplyDefaults also validates the config.

The value for global will saved.

func (*Config) Clone 

func (c *Config) Clone() (Config, error)

Clone makes a deep copy of the config along with global settings.

func (Config) MarshalYAML 

func (c Config) MarshalYAML() (interface{}, error)

MarshalYAML implements yaml.Marshaler.

func (*Config) RegisterFlags 

func (c *Config) RegisterFlags(f *flag.FlagSet)

func (*Config) UnmarshalYAML 

func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements yaml.Unmarshaler.

type ErrInvalidUpdate 

type ErrInvalidUpdate struct {
	Inner error
}

ErrInvalidUpdate is returned whenever Update is called against an instance but an invalid field is changed between configs. If ErrInvalidUpdate is returned, the instance must be fully stopped and replaced with a new one with the new config.

func (ErrInvalidUpdate) As 

func (e ErrInvalidUpdate) As(err interface{}) bool

As will set the err object to ErrInvalidUpdate provided err is a pointer to ErrInvalidUpdate.

func (ErrInvalidUpdate) Error 

func (e ErrInvalidUpdate) Error() string

Error implements the error interface.

func (ErrInvalidUpdate) Is 

func (e ErrInvalidUpdate) Is(err error) bool

Is returns true if err is an ErrInvalidUpdate.

type Factory 

type Factory func(c Config) (ManagedInstance, error)

Factory should return an unstarted instance given some config.

type Instance 

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

Instance is an individual metrics collector and remote_writer.

func New 

func New(reg prometheus.Registerer, cfg Config, metrics *wal.Metrics, logger log.Logger) (*Instance, error)

New creates a new Instance with a directory for storing the WAL. The instance will not start until Run is called on the instance.

func (*Instance) Appender 

func (i *Instance) Appender(ctx context.Context) storage.Appender

Appender returns a storage.Appender from the instance's WAL

func (*Instance) Ready 

func (i *Instance) Ready() bool

Ready indicates if the instance is ready for processing.

func (*Instance) Run 

func (i *Instance) Run(ctx context.Context) error

Run starts the instance, initializing Prometheus components, and will continue to run until an error happens during execution or the provided context is cancelled.

Run may be re-called after exiting, as components will be reinitialized each time Run is called.

func (*Instance) Stop 

func (i *Instance) Stop() error

Stop stops the WAL

func (*Instance) Storage 

func (i *Instance) Storage() storage.Storage

func (*Instance) StorageDirectory 

func (i *Instance) StorageDirectory() string

StorageDirectory returns the directory where this Instance is writing series and samples to for the WAL.

func (*Instance) Tenant 

func (i *Instance) Tenant() string

Tenant returns the tenant name of the instance

func (*Instance) Update 

func (i *Instance) Update(c Config) (err error)

Update accepts a new Config for the Instance and will dynamically update any running Prometheus components with the new values from Config. Update will return an ErrInvalidUpdate if the Update could not be applied.

type ManagedInstance 

type ManagedInstance interface {
	Ready() bool
	Run(ctx context.Context) error
	Update(c Config) error
	StorageDirectory() string
	Appender(ctx context.Context) storage.Appender
	Stop() error
	Tenant() string
}

ManagedInstance is implemented by Instance. It is defined as an interface for the sake of testing from Manager implementations.

type Manager 

type Manager interface {
	// GetInstance retrieves a ManagedInstance by name.
	GetInstance(name string) (ManagedInstance, error)

	// ListInstances returns all currently managed instances running
	// within the Manager. The key will be the instance name from their config.
	ListInstances() map[string]ManagedInstance

	// ListConfigs returns the config objects associated with a managed
	// instance. The key will be the Name field from Config.
	ListConfigs() map[string]Config

	// ApplyConfig creates a new Config or updates an existing Config if
	// one with Config.Name already exists.
	ApplyConfig(Config) error

	// DeleteConfig deletes a given managed instance based on its Config.Name.
	DeleteConfig(name string) error

	// Ready indicates if all instances are ready for processing.
	Ready() bool

	// InstanceReady indicates if an instance is ready for processing.
	InstanceReady(name string) bool

	// Stop stops the Manager and all managed instances.
	Stop()
}

Manager represents a set of methods for manipulating running instances at runtime.

type MetricValueCollector 

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

MetricValueCollector wraps around a Gatherer and provides utilities for pulling metric values from a given metric name and label matchers.

This is used by the agent instances to find the most recent timestamp successfully remote_written to for purposes of safely truncating the WAL.

MetricValueCollector is only intended for use with Gauges and Counters.

func NewMetricValueCollector 

func NewMetricValueCollector(g prometheus.Gatherer, match string) *MetricValueCollector

NewMetricValueCollector creates a new MetricValueCollector.

func (*MetricValueCollector) GetValues 

func (vc *MetricValueCollector) GetValues(label string, labelValues ...string) ([]float64, error)

GetValues looks through all the tracked metrics and returns all values for metrics that match some key value pair.

type Metrics 

type Metrics struct {
	AbnormalExits    *prometheus.CounterVec
	RunningInstances prometheus.Gauge
	// contains filtered or unexported fields
}

func NewMetrics 

func NewMetrics(r prometheus.Registerer) *Metrics

type MockManager 

type MockManager struct {
	GetInstanceFunc   func(name string) (ManagedInstance, error)
	ListInstancesFunc func() map[string]ManagedInstance
	ListConfigsFunc   func() map[string]Config
	ApplyConfigFunc   func(Config) error
	DeleteConfigFunc  func(name string) error
	StopFunc          func()
}

MockManager exposes methods of the Manager interface as struct fields. Useful for tests.

func (MockManager) ApplyConfig 

func (m MockManager) ApplyConfig(c Config) error

ApplyConfig implements Manager.

func (MockManager) DeleteConfig 

func (m MockManager) DeleteConfig(name string) error

DeleteConfig implements Manager.

func (MockManager) GetInstance 

func (m MockManager) GetInstance(name string) (ManagedInstance, error)

GetInstance implements Manager.

func (MockManager) InstanceReady 

func (m MockManager) InstanceReady(name string) bool

func (MockManager) ListConfigs 

func (m MockManager) ListConfigs() map[string]Config

ListConfigs implements Manager.

func (MockManager) ListInstances 

func (m MockManager) ListInstances() map[string]ManagedInstance

ListInstances implements Manager.

func (MockManager) Ready 

func (m MockManager) Ready() bool

func (MockManager) Stop 

func (m MockManager) Stop()

Stop implements Manager.

Source Files

View all Source files

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