rebase: bump github.com/hashicorp/vault/api from 1.2.0 to 1.3.0

Bumps [github.com/hashicorp/vault/api](https://github.com/hashicorp/vault) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/hashicorp/vault/releases)
- [Changelog](https://github.com/hashicorp/vault/blob/main/CHANGELOG.md)
- [Commits](https://github.com/hashicorp/vault/compare/v1.2.0...v1.3.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/vault/api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/armon/go-metrics/inmem_endpoint.go

@@ -1,6 +1,7 @@
 package metrics
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"sort"
@@ -68,6 +69,10 @@ func (i *InmemSink) DisplayMetrics(resp http.ResponseWriter, req *http.Request)
 		interval = data[n-2]
 	}
 
+	return newMetricSummaryFromInterval(interval), nil
+}
+
+func newMetricSummaryFromInterval(interval *IntervalMetrics) MetricsSummary {
 	interval.RLock()
 	defer interval.RUnlock()
 
@@ -103,7 +108,7 @@ func (i *InmemSink) DisplayMetrics(resp http.ResponseWriter, req *http.Request)
 	summary.Counters = formatSamples(interval.Counters)
 	summary.Samples = formatSamples(interval.Samples)
 
-	return summary, nil
+	return summary
 }
 
 func formatSamples(source map[string]SampledValue) []SampledValue {
@@ -129,3 +134,29 @@ func formatSamples(source map[string]SampledValue) []SampledValue {
 
 	return output
 }
+
+type Encoder interface {
+	Encode(interface{}) error
+}
+
+// Stream writes metrics using encoder.Encode each time an interval ends. Runs
+// until the request context is cancelled, or the encoder returns an error.
+// The caller is responsible for logging any errors from encoder.
+func (i *InmemSink) Stream(ctx context.Context, encoder Encoder) {
+	interval := i.getInterval()
+
+	for {
+		select {
+		case <-interval.done:
+			summary := newMetricSummaryFromInterval(interval)
+			if err := encoder.Encode(summary); err != nil {
+				return
+			}
+
+			// update interval to the next one
+			interval = i.getInterval()
+		case <-ctx.Done():
+			return
+		}
+	}
+}