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Add consul.xds.server.streamStart metric (#14957) 

This adds a new consul.xds.server.streamStart metric to measure the time taken to first generate xDS resources after an xDS stream is opened.
This commit is contained in:
Paul Glass 2022-10-12 14:17:58 -05:00 committed by GitHub
parent 4bc4ef135c
commit bcda205f88
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6 changed files with 35 additions and 3 deletions
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3
.changelog/14957.txt Normal file
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@ -0,0 +1,3 @@
```release-note:improvement
telemetry: Added a `consul.xds.server.streamStart` metric to measure time taken to first generate xDS resources for an xDS stream.
```

2
agent/setup.go
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@ -202,7 +202,6 @@ func newConnPool(config *config.RuntimeConfig, logger hclog.Logger, tls *tlsutil
}
// getPrometheusDefs reaches into every slice of prometheus defs we've defined in each part of the agent, and appends
//
// all of our slices into one nice slice of definitions per metric type for the Consul agent to pass to go-metrics.
func getPrometheusDefs(cfg lib.TelemetryConfig, isServer bool) ([]prometheus.GaugeDefinition, []prometheus.CounterDefinition, []prometheus.SummaryDefinition) {
// TODO: "raft..." metrics come from the raft lib and we should migrate these to a telemetry
@ -345,6 +344,7 @@ func getPrometheusDefs(cfg lib.TelemetryConfig, isServer bool) ([]prometheus.Gau
fsm.CommandsSummaries,
fsm.SnapshotSummaries,
raftSummaries,
xds.StatsSummaries,
}
// Flatten definitions
// NOTE(kit): Do we actually want to create a set here so we can ensure definition names are unique?

8
agent/xds/delta.go
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@ -5,6 +5,7 @@ import (
"encoding/hex"
"fmt"
"sort"
"sync"
"sync/atomic"
"time"
@ -104,6 +105,9 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
proxyID structs.ServiceID
nonce uint64 // xDS requires a unique nonce to correlate response/request pairs
ready bool // set to true after the first snapshot arrives
streamStartTime = time.Now()
streamStartOnce sync.Once
)
var (
@ -360,6 +364,10 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
generator.Logger.Trace("Invoking all xDS resource handlers and sending changed data if there are any")
streamStartOnce.Do(func() {
metrics.MeasureSince([]string{"xds", "server", "streamStart"}, streamStartTime)
})
for _, op := range xDSUpdateOrder {
err, sent := handlers[op.TypeUrl].SendIfNew(
cfgSnap.Kind,

15
agent/xds/delta_test.go
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@ -1448,7 +1448,7 @@ func TestServer_DeltaAggregatedResources_v3_StreamDrained(t *testing.T) {
}
})
testutil.RunStep(t, "check drain counter incremeted", func(t *testing.T) {
testutil.RunStep(t, "check drain counter incremented", func(t *testing.T) {
data := scenario.sink.Data()
require.Len(t, data, 1)
@ -1459,6 +1459,19 @@ func TestServer_DeltaAggregatedResources_v3_StreamDrained(t *testing.T) {
require.True(t, ok)
require.Equal(t, 1, val.Count)
})
testutil.RunStep(t, "check streamStart metric recorded", func(t *testing.T) {
data := scenario.sink.Data()
require.Len(t, data, 1)
item := data[0]
require.Len(t, item.Counters, 1)
val, ok := item.Samples["consul.xds.test.xds.server.streamStart"]
require.True(t, ok)
require.Equal(t, 1, val.Count)
})
}
type testLimiter struct {

7
agent/xds/server.go
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@ -37,6 +37,13 @@ var StatsCounters = []prometheus.CounterDefinition{
},
}
var StatsSummaries = []prometheus.SummaryDefinition{
{
Name: []string{"xds", "server", "streamStart"},
Help: "Measures the time in milliseconds after an xDS stream is opened until xDS resources are first generated for the stream.",
},
}
// ADSStream is a shorter way of referring to this thing...
type ADSStream = envoy_discovery_v3.AggregatedDiscoveryService_StreamAggregatedResourcesServer

1
website/content/docs/agent/telemetry.mdx
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@ -542,6 +542,7 @@ These metrics are used to monitor the health of the Consul servers.
| `consul.xds.server.streams` | Measures the number of active xDS streams handled by the server split by protocol version. | streams | gauge |
| `consul.xds.server.idealStreamsMax` | The maximum number of xDS streams per server, chosen to achieve a roughly even spread of load across servers. | streams | gauge |
| `consul.xds.server.streamDrained` | Counts the number of xDS streams that are drained when rebalancing the load between servers. | streams | counter |
| `consul.xds.server.streamStart` | Measures the time taken to first generate xDS resources after an xDS stream is opened. | ms | timer |
## Server Workload