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990e1982c7
# Which Problems Are Solved
There were multiple issues in the OpenTelemetry (OTEL) implementation
and usage for tracing and metrics, which lead to high cardinality and
potential memory leaks:
- wrongly initiated tracing interceptors
- high cardinality in traces:
- HTTP/1.1 endpoints containing host names
- HTTP/1.1 endpoints containing object IDs like userID (e.g.
`/management/v1/users/2352839823/`)
- high amount of traces from internal processes (spooler)
- high cardinality in metrics endpoint:
- GRPC entries containing host names
- notification metrics containing instanceIDs and error messages
# How the Problems Are Solved
- Properly initialize the interceptors once and update them to use the
grpc stats handler (unary interceptors were deprecated).
- Remove host names from HTTP/1.1 span names and use path as default.
- Set / overwrite the uri for spans on the grpc-gateway with the uri
pattern (`/management/v1/users/{user_id}`). This is used for spans in
traces and metric entries.
- Created a new sampler which will only sample spans in the following
cases:
- remote was already sampled
- remote was not sampled, root span is of kind `Server` and based on
fraction set in the runtime configuration
- This will prevent having a lot of spans from the spooler back ground
jobs if they were not started by a client call querying an object (e.g.
UserByID).
- Filter out host names and alike from OTEL generated metrics (using a
`view`).
- Removed instance and error messages from notification metrics.
# Additional Changes
Fixed the middleware handling for serving Console. Telemetry and
instance selection are only used for the environment.json, but not on
statically served files.
# Additional Context
- closes #8096
- relates to #9074
- back ports to at least 2.66.x, 2.67.x and 2.68.x
81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package tracing
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import (
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"context"
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"testing"
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"github.com/stretchr/testify/assert"
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sdk_trace "go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/trace"
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)
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func TestSpanKindBased(t *testing.T) {
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type args struct {
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sampler sdk_trace.Sampler
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kinds []trace.SpanKind
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}
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type want struct {
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description string
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sampled int
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}
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tests := []struct {
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name string
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args args
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want want
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}{
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{
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"never sample, no sample",
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args{
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sampler: sdk_trace.NeverSample(),
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kinds: []trace.SpanKind{trace.SpanKindServer},
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},
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want{
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description: "SpanKindBased{sampler:AlwaysOffSampler,kinds:[server]}",
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sampled: 0,
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},
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},
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{
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"always sample, no kind, no sample",
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args{
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sampler: sdk_trace.AlwaysSample(),
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kinds: nil,
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},
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want{
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description: "SpanKindBased{sampler:AlwaysOnSampler,kinds:[]}",
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sampled: 0,
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},
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},
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{
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"always sample, 2 kinds, 2 samples",
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args{
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sampler: sdk_trace.AlwaysSample(),
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kinds: []trace.SpanKind{trace.SpanKindServer, trace.SpanKindClient},
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},
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want{
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description: "SpanKindBased{sampler:AlwaysOnSampler,kinds:[server client]}",
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sampled: 2,
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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sampler := SpanKindBased(tt.args.sampler, tt.args.kinds...)
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assert.Equal(t, tt.want.description, sampler.Description())
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p := sdk_trace.NewTracerProvider(sdk_trace.WithSampler(sampler))
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tr := p.Tracer("test")
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var sampled int
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for i := trace.SpanKindUnspecified; i <= trace.SpanKindConsumer; i++ {
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ctx := context.Background()
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_, span := tr.Start(ctx, "test", trace.WithSpanKind(i))
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if span.SpanContext().IsSampled() {
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sampled++
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}
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}
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assert.Equal(t, tt.want.sampled, sampled)
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})
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}
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}
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