NewOverrides makes a new Overrides.

TODO(jordanrushing): break out overrides from defaults?.

SetDefaultLimitsForYAMLUnmarshalling sets global default limits, used when loading Limits from YAML files.

DuplicateLabelNames is a reason for discarding a log line which has duplicate label names.

GlobalRateLimitStrat represents a ingestion rate limiting strategy that enforces the rate limiting globally, configuring a per-distributor local rate limiter as "ingestion_rate / N", where N is the number of distributor replicas (it's automatically adjusted if the number of replicas change).

GreaterThanMaxSampleAge is a reason for discarding log lines which are older than the current time - `reject_old_samples_max_age`.

InvalidLabels is a reason for discarding log lines which have labels that cannot be parsed.

LabelNameTooLong is a reason for discarding a log line which has a label name too long.

LabelValueTooLong is a reason for discarding a log line which has a lable value too long.

LineTooLong is a reason for discarding too long log lines.

LocalRateLimitStrat represents a ingestion rate limiting strategy that enforces the limit on a per distributor basis.

MaxLabelNamesPerSeries is a reason for discarding a log line which has too many label names.

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.

RateLimited is one of the values for the reason to discard samples.

StreamLimit is a reason for discarding lines when we can't create a new stream because the limit of active streams has been reached.

StreamRateLimit is a reason for discarding lines when the streams own rate limit is hit rather than the overall ingestion rate limit.

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.

TooFarInFuture is a reason for discarding log lines which are newer than the current time + `creation_grace_period`.

DiscardedBytes is a metric of the total discarded bytes, by reason.

DiscardedSamples is a metric of the number of discarded samples, by reason.

MutatedBytes is a metric of the total mutated bytes, by reason.

MutatedSamples is a metric of the total number of lines mutated, by reason.

Limits describe all the limits for users; can be used to describe global default limits via flags, or per-user limits via yaml config.

Overrides periodically fetch a set of per-user overrides, and provides convenience functions for fetching the correct value.

OverwriteMarshalingStringMap will overwrite the src map when unmarshaling as opposed to merging.

RateLimit is a colocated limit & burst config.

LimitError are errors that do not comply with the limits specified.