validate.go

package validation

import (
	"fmt"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"

	"github.com/grafana/loki/pkg/util/flagext"
)

const (
	ReasonLabel = "reason"
	// InvalidLabels is a reason for discarding log lines which have labels that cannot be parsed.
	InvalidLabels = "invalid_labels"
	MissingLabels = "missing_labels"

	MissingLabelsErrorMsg = "error at least one label pair is required per stream"
	InvalidLabelsErrorMsg = "Error parsing labels '%s' with error: %s"
	// RateLimited is one of the values for the reason to discard samples.
	// Declared here to avoid duplication in ingester and distributor.
	RateLimited         = "rate_limited"
	RateLimitedErrorMsg = "Ingestion rate limit exceeded for user %s (limit: %d bytes/sec) while attempting to ingest '%d' lines totaling '%d' bytes, reduce log volume or contact your Loki administrator to see if the limit can be increased"
	// LineTooLong is a reason for discarding too long log lines.
	LineTooLong         = "line_too_long"
	LineTooLongErrorMsg = "Max entry size '%d' bytes exceeded for stream '%s' while adding an entry with length '%d' bytes"
	// StreamLimit is a reason for discarding lines when we can't create a new stream
	// because the limit of active streams has been reached.
	StreamLimit         = "stream_limit"
	StreamLimitErrorMsg = "Maximum active stream limit exceeded, reduce the number of active streams (reduce labels or reduce label values), or contact your Loki administrator to see if the limit can be increased, user: '%s'"
	// StreamRateLimit is a reason for discarding lines when the streams own rate limit is hit
	// rather than the overall ingestion rate limit.
	StreamRateLimit = "per_stream_rate_limit"
	// OutOfOrder is a reason for discarding lines when Loki doesn't accept out
	// of order log lines (parameter `-ingester.unordered-writes` is set to
	// `false`) and the lines in question are older than the newest line in the
	// stream.
	OutOfOrder = "out_of_order"
	// TooFarBehind is a reason for discarding lines when Loki accepts
	// unordered ingest  (parameter `-ingester.unordered-writes` is set to
	// `true`, which is the default) and the lines in question are older than
	// half of `-ingester.max-chunk-age` compared to the newest line in the
	// stream.
	TooFarBehind = "too_far_behind"
	// GreaterThanMaxSampleAge is a reason for discarding log lines which are older than the current time - `reject_old_samples_max_age`
	GreaterThanMaxSampleAge         = "greater_than_max_sample_age"
	GreaterThanMaxSampleAgeErrorMsg = "entry for stream '%s' has timestamp too old: %v, oldest acceptable timestamp is: %v"
	// TooFarInFuture is a reason for discarding log lines which are newer than the current time + `creation_grace_period`
	TooFarInFuture         = "too_far_in_future"
	TooFarInFutureErrorMsg = "entry for stream '%s' has timestamp too new: %v"
	// MaxLabelNamesPerSeries is a reason for discarding a log line which has too many label names
	MaxLabelNamesPerSeries         = "max_label_names_per_series"
	MaxLabelNamesPerSeriesErrorMsg = "entry for stream '%s' has %d label names; limit %d"
	// LabelNameTooLong is a reason for discarding a log line which has a label name too long
	LabelNameTooLong         = "label_name_too_long"
	LabelNameTooLongErrorMsg = "stream '%s' has label name too long: '%s'"
	// LabelValueTooLong is a reason for discarding a log line which has a lable value too long
	LabelValueTooLong         = "label_value_too_long"
	LabelValueTooLongErrorMsg = "stream '%s' has label value too long: '%s'"
	// DuplicateLabelNames is a reason for discarding a log line which has duplicate label names
	DuplicateLabelNames         = "duplicate_label_names"
	DuplicateLabelNamesErrorMsg = "stream '%s' has duplicate label name: '%s'"
)

type ErrStreamRateLimit struct {
	RateLimit flagext.ByteSize
	Labels    string
	Bytes     flagext.ByteSize
}

func (e *ErrStreamRateLimit) Error() string {
	return fmt.Sprintf("Per stream rate limit exceeded (limit: %s/sec) while attempting to ingest for stream '%s' totaling %s, consider splitting a stream via additional labels or contact your Loki administrator to see if the limit can be increased",
		e.RateLimit.String(),
		e.Labels,
		e.Bytes.String())
}

// MutatedSamples is a metric of the total number of lines mutated, by reason.
var MutatedSamples = promauto.NewCounterVec(
	prometheus.CounterOpts{
		Namespace: "loki",
		Name:      "mutated_samples_total",
		Help:      "The total number of samples that have been mutated.",
	},
	[]string{ReasonLabel, "truncated"},
)

// MutatedBytes is a metric of the total mutated bytes, by reason.
var MutatedBytes = promauto.NewCounterVec(
	prometheus.CounterOpts{
		Namespace: "loki",
		Name:      "mutated_bytes_total",
		Help:      "The total number of bytes that have been mutated.",
	},
	[]string{ReasonLabel, "truncated"},
)

// DiscardedBytes is a metric of the total discarded bytes, by reason.
var DiscardedBytes = promauto.NewCounterVec(
	prometheus.CounterOpts{
		Namespace: "loki",
		Name:      "discarded_bytes_total",
		Help:      "The total number of bytes that were discarded.",
	},
	[]string{ReasonLabel, "tenant"},
)

// DiscardedSamples is a metric of the number of discarded samples, by reason.
var DiscardedSamples = promauto.NewCounterVec(
	prometheus.CounterOpts{
		Namespace: "loki",
		Name:      "discarded_samples_total",
		Help:      "The total number of samples that were discarded.",
	},
	[]string{ReasonLabel, "tenant"},
)

var LineLengthHist = promauto.NewHistogram(prometheus.HistogramOpts{
	Namespace: "loki",
	Name:      "bytes_per_line",
	Help:      "The total number of bytes per line.",
	Buckets:   prometheus.ExponentialBuckets(1, 8, 8), // 1B -> 16MB
})