service

type Collector interface {
	Describe(chan<- *prometheus.Desc)
	Collect(chan<- prometheus.Metric)
}

type Config struct {
	RuntimeMode   int
	NoTrackMode   bool
	ConnDefaults  map[string]string `yaml:"defaults"` // Defaults
	ConnsSettings ConnsSettings
	// DatabasesRE defines regexp with databases from which builtin metrics should be collected.
	DatabasesRE        *regexp.Regexp
	DisabledCollectors []string
	// CollectorsSettings defines all collector settings propagated from main YAML configuration.
	CollectorsSettings model.CollectorsSettings
	CollectTopTable    int
	CollectTopIndex    int
	CollectTopQuery    int
	SkipConnErrorMode  bool
	ConstLabels        *map[string]*map[string]string
	TargetLabels       *map[string]*map[string]string
	ConnTimeout        int  // in seconds
	ThrottlingInterval *int // in seconds, default 25
	ConcurrencyLimit   *int
}

type ConnSetting struct {
	// ServiceType defines type of service for which these connection settings are used.
	ServiceType string `yaml:"service_type"`
	// Conninfo is the connection string in service-specific format.
	Conninfo string `yaml:"conninfo"`
	// BaseURL is the base URL for connecting to HTTP services.
	BaseURL string `yaml:"baseurl"`
	//TargetLabels array of labels for /targets endpoint
	TargetLabels *[]Label `yaml:"target_labels"`
}

type ConnsSettings map[string]ConnSetting

type Label struct {
	Name  string `yaml:"name" json:"name"`
	Value string `yaml:"value" json:"value"`
}

type PgSCVCollector interface {
	Collector
	FlushServiceConfig()
}

type Repository struct {
	sync.RWMutex                    // protect concurrent access
	Services     map[string]Service // service repo store
	Registries   map[string]*prometheus.Registry
}

type Service struct {
	// Service identifier is unique key across all monitored services and used to distinguish services of the same type
	// running on the single host (two Postgres services running on the same host but listening on different ports).
	// Hence not to mix their metrics the ServiceID is introduced and attached to metrics as "sid" label:
	// metric_xact_commits{database="test", sid="postgres:5432"} -- metric from the first postgres running on 5432 port
	// metric_xact_commits{database="test", sid="postgres:5433"} -- metric from the second postgres running on 5433 port
	ServiceID string
	// Connection settings required for connecting to the service.
	ConnSettings ConnSetting
	// Prometheus-based metrics collector associated with the service. Each 'service' has its own dedicated collector instance
	// which implements a service-specific set of metric collectors.
	Collector    PgSCVCollector
	ConstLabels  *map[string]string
	TargetLabels *map[string]string
}