service

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

type Config struct {
	RuntimeMode        int
	NoTrackMode        bool
	ProjectID          string
	ConnDefaults       map[string]string `yaml:"defaults"` // Defaults
	ConnSettings       []ConnSetting
	Filters            map[string]filter.Filter
	DisabledCollectors []string
}

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"`
}

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

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
	// Project identifier is unique key across all projects (project may have several instances). ProjectID also is attached
	// as a label and unions metrics collected from the several hosts. See example below, there are two metrics from different
	// hosts but these hosts belong to the same "project" with ID = 1.
	// metric_xact_rollbacks{db_instance="host-1" sid="postgres:5432", database="test", project_id="1"}
	// metric_xact_rollbacks{db_instance="host-2" sid="postgres:5432", database="test", project_id="1"}
	ProjectID 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 Collector
	// TotalErrors represents total number of times where service's health checks failed. When errors limit is reached service
	// removed from the repo.
	TotalErrors int
}