open-consul/lib/telemetry.go

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package lib
import (
"context"
"errors"
"net"
"net/http"
"sync"
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"time"
"github.com/armon/go-metrics"
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"github.com/armon/go-metrics/circonus"
"github.com/armon/go-metrics/datadog"
"github.com/armon/go-metrics/prometheus"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-multierror"
prometheuscore "github.com/prometheus/client_golang/prometheus"
"github.com/hashicorp/consul/lib/retry"
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)
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// TelemetryConfig is embedded in config.RuntimeConfig and holds the
// configuration variables for go-metrics. It is a separate struct to allow it
// to be exported as JSON and passed to other process like managed connect
// proxies so they can inherit the agent's telemetry config.
//
// It is in lib package rather than agent/config because we need to use it in
// the shared InitTelemetry functions below, but we can't import agent/config
// due to a dependency cycle.
type TelemetryConfig struct {
// Disable may be set to true to have InitTelemetry to skip initialization
// and return a nil MetricsSink.
Disable bool
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// Circonus*: see https://github.com/circonus-labs/circonus-gometrics
// for more details on the various configuration options.
// Valid configuration combinations:
// - CirconusAPIToken
// metric management enabled (search for existing check or create a new one)
// - CirconusSubmissionUrl
// metric management disabled (use check with specified submission_url,
// broker must be using a public SSL certificate)
// - CirconusAPIToken + CirconusCheckSubmissionURL
// metric management enabled (use check with specified submission_url)
// - CirconusAPIToken + CirconusCheckID
// metric management enabled (use check with specified id)
// CirconusAPIApp is an app name associated with API token.
// Default: "consul"
//
// hcl: telemetry { circonus_api_app = string }
CirconusAPIApp string `json:"circonus_api_app,omitempty" mapstructure:"circonus_api_app"`
// CirconusAPIToken is a valid API Token used to create/manage check. If provided,
// metric management is enabled.
// Default: none
//
// hcl: telemetry { circonus_api_token = string }
CirconusAPIToken string `json:"circonus_api_token,omitempty" mapstructure:"circonus_api_token"`
// CirconusAPIURL is the base URL to use for contacting the Circonus API.
// Default: "https://api.circonus.com/v2"
//
// hcl: telemetry { circonus_api_url = string }
CirconusAPIURL string `json:"circonus_apiurl,omitempty" mapstructure:"circonus_apiurl"`
// CirconusBrokerID is an explicit broker to use when creating a new check. The numeric portion
// of broker._cid. If metric management is enabled and neither a Submission URL nor Check ID
// is provided, an attempt will be made to search for an existing check using Instance ID and
// Search Tag. If one is not found, a new HTTPTRAP check will be created.
// Default: use Select Tag if provided, otherwise, a random Enterprise Broker associated
// with the specified API token or the default Circonus Broker.
// Default: none
//
// hcl: telemetry { circonus_broker_id = string }
CirconusBrokerID string `json:"circonus_broker_id,omitempty" mapstructure:"circonus_broker_id"`
// CirconusBrokerSelectTag is a special tag which will be used to select a broker when
// a Broker ID is not provided. The best use of this is to as a hint for which broker
// should be used based on *where* this particular instance is running.
// (e.g. a specific geo location or datacenter, dc:sfo)
// Default: none
//
// hcl: telemetry { circonus_broker_select_tag = string }
CirconusBrokerSelectTag string `json:"circonus_broker_select_tag,omitempty" mapstructure:"circonus_broker_select_tag"`
// CirconusCheckDisplayName is the name for the check which will be displayed in the Circonus UI.
// Default: value of CirconusCheckInstanceID
//
// hcl: telemetry { circonus_check_display_name = string }
CirconusCheckDisplayName string `json:"circonus_check_display_name,omitempty" mapstructure:"circonus_check_display_name"`
// CirconusCheckForceMetricActivation will force enabling metrics, as they are encountered,
// if the metric already exists and is NOT active. If check management is enabled, the default
// behavior is to add new metrics as they are encountered. If the metric already exists in the
// check, it will *NOT* be activated. This setting overrides that behavior.
// Default: "false"
//
// hcl: telemetry { circonus_check_metrics_activation = (true|false)
CirconusCheckForceMetricActivation string `json:"circonus_check_force_metric_activation,omitempty" mapstructure:"circonus_check_force_metric_activation"`
// CirconusCheckID is the check id (not check bundle id) from a previously created
// HTTPTRAP check. The numeric portion of the check._cid field.
// Default: none
//
// hcl: telemetry { circonus_check_id = string }
CirconusCheckID string `json:"circonus_check_id,omitempty" mapstructure:"circonus_check_id"`
// CirconusCheckInstanceID serves to uniquely identify the metrics coming from this "instance".
// It can be used to maintain metric continuity with transient or ephemeral instances as
// they move around within an infrastructure.
// Default: hostname:app
//
// hcl: telemetry { circonus_check_instance_id = string }
CirconusCheckInstanceID string `json:"circonus_check_instance_id,omitempty" mapstructure:"circonus_check_instance_id"`
// CirconusCheckSearchTag is a special tag which, when coupled with the instance id, helps to
// narrow down the search results when neither a Submission URL or Check ID is provided.
// Default: service:app (e.g. service:consul)
//
// hcl: telemetry { circonus_check_search_tag = string }
CirconusCheckSearchTag string `json:"circonus_check_search_tag,omitempty" mapstructure:"circonus_check_search_tag"`
// CirconusCheckSearchTag is a special tag which, when coupled with the instance id, helps to
// narrow down the search results when neither a Submission URL or Check ID is provided.
// Default: service:app (e.g. service:consul)
//
// hcl: telemetry { circonus_check_tags = string }
CirconusCheckTags string `json:"circonus_check_tags,omitempty" mapstructure:"circonus_check_tags"`
// CirconusSubmissionInterval is the interval at which metrics are submitted to Circonus.
// Default: 10s
//
// hcl: telemetry { circonus_submission_interval = "duration" }
CirconusSubmissionInterval string `json:"circonus_submission_interval,omitempty" mapstructure:"circonus_submission_interval"`
// CirconusCheckSubmissionURL is the check.config.submission_url field from a
// previously created HTTPTRAP check.
// Default: none
//
// hcl: telemetry { circonus_submission_url = string }
CirconusSubmissionURL string `json:"circonus_submission_url,omitempty" mapstructure:"circonus_submission_url"`
// DisableHostname will disable hostname prefixing for all metrics.
//
// hcl: telemetry { disable_hostname = (true|false)
DisableHostname bool `json:"disable_hostname,omitempty" mapstructure:"disable_hostname"`
// DogStatsdAddr is the address of a dogstatsd instance. If provided,
// metrics will be sent to that instance
//
// hcl: telemetry { dogstatsd_addr = string }
DogstatsdAddr string `json:"dogstatsd_addr,omitempty" mapstructure:"dogstatsd_addr"`
// DogStatsdTags are the global tags that should be sent with each packet to dogstatsd
// It is a list of strings, where each string looks like "my_tag_name:my_tag_value"
//
// hcl: telemetry { dogstatsd_tags = []string }
DogstatsdTags []string `json:"dogstatsd_tags,omitempty" mapstructure:"dogstatsd_tags"`
// RetryFailedConfiguration retries transient errors when setting up sinks (e.g. network errors when connecting to telemetry backends).
//
// hcl: telemetry { retry_failed_connection = (true|false) }
RetryFailedConfiguration bool `json:"retry_failed_connection,omitempty" mapstructure:"retry_failed_connection"`
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// FilterDefault is the default for whether to allow a metric that's not
// covered by the filter.
//
// hcl: telemetry { filter_default = (true|false) }
FilterDefault bool `json:"filter_default,omitempty" mapstructure:"filter_default"`
// AllowedPrefixes is a list of filter rules to apply for allowing metrics
// by prefix. Use the 'prefix_filter' option and prefix rules with '+' to be
// included.
//
// hcl: telemetry { prefix_filter = []string{"+<expr>", "+<expr>", ...} }
AllowedPrefixes []string `json:"allowed_prefixes,omitempty" mapstructure:"allowed_prefixes"`
// BlockedPrefixes is a list of filter rules to apply for blocking metrics
// by prefix. Use the 'prefix_filter' option and prefix rules with '-' to be
// excluded.
//
// hcl: telemetry { prefix_filter = []string{"-<expr>", "-<expr>", ...} }
BlockedPrefixes []string `json:"blocked_prefixes,omitempty" mapstructure:"blocked_prefixes"`
// MetricsPrefix is the prefix used to write stats values to.
// Default: "consul."
//
// hcl: telemetry { metrics_prefix = string }
MetricsPrefix string `json:"metrics_prefix,omitempty" mapstructure:"metrics_prefix"`
// StatsdAddr is the address of a statsd instance. If provided,
// metrics will be sent to that instance.
//
// hcl: telemetry { statsd_address = string }
StatsdAddr string `json:"statsd_address,omitempty" mapstructure:"statsd_address"`
// StatsiteAddr is the address of a statsite instance. If provided,
// metrics will be streamed to that instance.
//
// hcl: telemetry { statsite_address = string }
StatsiteAddr string `json:"statsite_address,omitempty" mapstructure:"statsite_address"`
// PrometheusOpts provides configuration for the PrometheusSink. Currently the only configuration
// we acquire from hcl is the retention time. We also use definition slices that are set in agent setup
// before being passed to InitTelemmetry.
//
// hcl: telemetry { prometheus_retention_time = "duration" }
PrometheusOpts prometheus.PrometheusOpts
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}
// MetricsHandler provides an http.Handler for displaying metrics.
type MetricsHandler interface {
DisplayMetrics(resp http.ResponseWriter, req *http.Request) (interface{}, error)
Stream(ctx context.Context, encoder metrics.Encoder)
}
type MetricsConfig struct {
Handler MetricsHandler
mu sync.Mutex
cancelFn context.CancelFunc
}
func (cfg *MetricsConfig) Cancel() {
cfg.mu.Lock()
defer cfg.mu.Unlock()
if cfg.cancelFn != nil {
cfg.cancelFn()
}
}
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func statsiteSink(cfg TelemetryConfig, hostname string) (metrics.MetricSink, error) {
addr := cfg.StatsiteAddr
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if addr == "" {
return nil, nil
}
return metrics.NewStatsiteSink(addr)
}
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func statsdSink(cfg TelemetryConfig, hostname string) (metrics.MetricSink, error) {
addr := cfg.StatsdAddr
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if addr == "" {
return nil, nil
}
return metrics.NewStatsdSink(addr)
}
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func dogstatdSink(cfg TelemetryConfig, hostname string) (metrics.MetricSink, error) {
addr := cfg.DogstatsdAddr
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if addr == "" {
return nil, nil
}
sink, err := datadog.NewDogStatsdSink(addr, hostname)
if err != nil {
return nil, err
}
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sink.SetTags(cfg.DogstatsdTags)
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return sink, nil
}
func prometheusSink(cfg TelemetryConfig, _ string) (metrics.MetricSink, error) {
if cfg.PrometheusOpts.Expiration.Nanoseconds() < 1 {
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return nil, nil
}
sink, err := prometheus.NewPrometheusSinkFrom(cfg.PrometheusOpts)
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if err != nil {
// During testing we may try to register the same metrics collector
// multiple times in a single run (e.g. a metrics test fails and
// we attempt a retry), resulting in an AlreadyRegisteredError.
// Suppress this and move on.
if errors.As(err, &prometheuscore.AlreadyRegisteredError{}) {
return nil, nil
}
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return nil, err
}
return sink, nil
}
func circonusSink(cfg TelemetryConfig, _ string) (metrics.MetricSink, error) {
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token := cfg.CirconusAPIToken
url := cfg.CirconusSubmissionURL
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if token == "" && url == "" {
return nil, nil
}
conf := &circonus.Config{}
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conf.Interval = cfg.CirconusSubmissionInterval
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conf.CheckManager.API.TokenKey = token
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conf.CheckManager.API.TokenApp = cfg.CirconusAPIApp
conf.CheckManager.API.URL = cfg.CirconusAPIURL
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conf.CheckManager.Check.SubmissionURL = url
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conf.CheckManager.Check.ID = cfg.CirconusCheckID
conf.CheckManager.Check.ForceMetricActivation = cfg.CirconusCheckForceMetricActivation
conf.CheckManager.Check.InstanceID = cfg.CirconusCheckInstanceID
conf.CheckManager.Check.SearchTag = cfg.CirconusCheckSearchTag
conf.CheckManager.Check.DisplayName = cfg.CirconusCheckDisplayName
conf.CheckManager.Check.Tags = cfg.CirconusCheckTags
conf.CheckManager.Broker.ID = cfg.CirconusBrokerID
conf.CheckManager.Broker.SelectTag = cfg.CirconusBrokerSelectTag
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if conf.CheckManager.Check.DisplayName == "" {
conf.CheckManager.Check.DisplayName = "Consul"
}
if conf.CheckManager.API.TokenApp == "" {
conf.CheckManager.API.TokenApp = "consul"
}
if conf.CheckManager.Check.SearchTag == "" {
conf.CheckManager.Check.SearchTag = "service:consul"
}
sink, err := circonus.NewCirconusSink(conf)
if err != nil {
return nil, err
}
sink.Start()
return sink, nil
}
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func configureSinks(cfg TelemetryConfig, memSink metrics.MetricSink) (metrics.FanoutSink, error) {
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metricsConf := metrics.DefaultConfig(cfg.MetricsPrefix)
metricsConf.EnableHostname = !cfg.DisableHostname
metricsConf.FilterDefault = cfg.FilterDefault
metricsConf.AllowedPrefixes = cfg.AllowedPrefixes
metricsConf.BlockedPrefixes = cfg.BlockedPrefixes
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var sinks metrics.FanoutSink
var errors error
addSink := func(fn func(TelemetryConfig, string) (metrics.MetricSink, error)) {
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s, err := fn(cfg, metricsConf.HostName)
if err != nil {
errors = multierror.Append(errors, err)
return
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}
if s != nil {
sinks = append(sinks, s)
}
}
addSink(statsiteSink)
addSink(statsdSink)
addSink(dogstatdSink)
addSink(circonusSink)
addSink(prometheusSink)
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if len(sinks) > 0 {
sinks = append(sinks, memSink)
metrics.NewGlobal(metricsConf, sinks)
} else {
metricsConf.EnableHostname = false
metrics.NewGlobal(metricsConf, memSink)
}
return sinks, errors
}
// InitTelemetry configures go-metrics based on map of telemetry config
// values as returned by Runtimecfg.Config().
// InitTelemetry retries configurating the sinks in case error is retriable
// and retry_failed_connection is set to true.
func InitTelemetry(cfg TelemetryConfig, logger hclog.Logger) (*MetricsConfig, error) {
if cfg.Disable {
return nil, nil
}
memSink := metrics.NewInmemSink(10*time.Second, time.Minute)
metrics.DefaultInmemSignal(memSink)
metricsConfig := &MetricsConfig{
Handler: memSink,
}
var cancel context.CancelFunc
var ctx context.Context
retryWithBackoff := func() {
waiter := &retry.Waiter{
MaxWait: 5 * time.Minute,
}
for {
logger.Warn("retrying configure metric sinks", "retries", waiter.Failures())
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_, err := configureSinks(cfg, memSink)
if err == nil {
logger.Info("successfully configured metrics sinks")
return
}
logger.Error("failed configure sinks", "error", multierror.Flatten(err))
if err := waiter.Wait(ctx); err != nil {
logger.Trace("stop retrying configure metrics sinks")
}
}
}
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if _, errs := configureSinks(cfg, memSink); errs != nil {
if isRetriableError(errs) && cfg.RetryFailedConfiguration {
logger.Warn("failed configure sinks", "error", multierror.Flatten(errs))
ctx, cancel = context.WithCancel(context.Background())
metricsConfig.mu.Lock()
metricsConfig.cancelFn = cancel
metricsConfig.mu.Unlock()
go retryWithBackoff()
} else {
return nil, errs
}
}
return metricsConfig, nil
}
func isRetriableError(errs error) bool {
var dnsError *net.DNSError
if errors.As(errs, &dnsError) && dnsError.IsNotFound {
return true
}
return false
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}