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README
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Sinks
Veneur is all about sending observability primitives on to other places.
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Documentation
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Index ¶
Constants ¶
const EventReportedCount = "sink.events_reported_total"
EventReportedCount number of events processed by a sink. Tagged with `sink:sink.Name()`.
const MetricKeyMetricFlushDuration = "sink.metric_flush_total_duration_ns"
MetricKeyMetricFlushDuration should be emitted as a timer by a MetricSink if possible. Tagged with `sink:sink.Name()`. The `Flush` function is a great place to do this.
const MetricKeySpanFlushDuration = "sink.span_flush_total_duration_ns"
MetricKeySpanFlushDuration should be emitted as a timer by a SpanSink if possible. Tagged with `sink:sink.Name()`. The `Flush` function is a great place to do this. If your sync does async sends, this might not be necessary.
const MetricKeySpanIngestDuration = "sink.span_ingest_total_duration_ns"
const MetricKeyTotalMetricsFlushed = "sink.metrics_flushed_total"
MetricKeyTotalMetricsFlushed should be emitted as a counter by a MetricSink if possible. Tagged with `sink:sink.Name()`. The `Flush` function is a great place to do this.
const MetricKeyTotalMetricsSkipped = "sink.metrics_skipped_total"
MetricKeyTotalMetricsSkipped should be emitted as a counter by a MetricSink if possible. Tagged with `sink:sink.Name()`. Track the number of metrics skipped, not applicable to this MetricSink.
const MetricKeyTotalSpansDropped = "sink.spans_dropped_total"
MetricKeyTotalSpansDropped tracks the number of spans that the sink is aware it has dropped. It should be emitted as a counter by a SpanSink if possible. Tagged with `sink:sink.Name()`. The `Flush` function is a great place to do this.
const MetricKeyTotalSpansFlushed = "sink.spans_flushed_total"
MetricKeyTotalSpansFlushed should be emitted as a counter by a SpanSink if possible. Tagged with `sink:sink.Name()`. The `Flush` function is a great place to do this.
const MetricKeyTotalSpansSkipped = "sink.spans_skipped_total"
MetricKeyTotalSpansSkipped tracks the number of spans that are skipped due to sampling, if sampling is enabled.
Variables ¶
This section is empty.
Functions ¶
func IsAcceptableMetric ¶ added in v1.9.0
func IsAcceptableMetric(metric samplers.InterMetric, sink MetricSink) bool
IsAcceptableMetric returns true if a metric is meant to be ingested by a given sink.
Types ¶
type MetricSink ¶
type MetricSink interface {
Name() string
// Start finishes setting up the sink and starts any
// background processing tasks that the sink might have to run
// in the background. It's invoked when the server starts.
Start(traceClient *trace.Client) error
// Flush receives `InterMetric`s from Veneur and is
// responsible for "sinking" these metrics to whatever it's
// backend wants. Note that the sink must **not** mutate the
// incoming metrics as they are shared with other sinks. Sinks
// must also check each metric with IsAcceptableMetric to
// verify they are eligible to consume the metric.
Flush(context.Context, []samplers.InterMetric) error
// Handle non-metric, non-span samples.
FlushOtherSamples(ctx context.Context, samples []ssf.SSFSample)
}
MetricSink is a receiver of `InterMetric`s when Veneur periodically flushes it's aggregated metrics.
type SpanSink ¶
type SpanSink interface {
// Start finishes setting up the sink and starts any
// background processing tasks that the sink might have to run
// in the background. It's invoked when the server starts.
Start(*trace.Client) error
// Name returns the span sink's name for debugging purposes
Name() string
// Flush receives `SSFSpan`s from Veneur **as they arrive**. If the sink wants
// to buffer spans it may do so and defer sending until `Flush` is called.
Ingest(*ssf.SSFSpan) error
// Invoked at the same interval as metric flushes, this can be used as a
// signal for the sink to write out if it was buffering or something.
Flush()
}
SpanSink is a receiver of spans that handles sending those spans to some downstream sink. Calls to `Ingest(span)` are meant to give the sink control of the span, with periodic calls to flush as a signal for sinks that don't handle their own flushing in a separate goroutine, etc. Note that SpanSinks differ from MetricSinks because Veneur does *not* aggregate Spans.
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