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interop/xds: Interop client and server changes for CSM Observability (#…
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…7280)
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@zasweq
zasweq authored May 31, 2024
1 parent 1958fcb commit 5d7bd7a
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Showing 8 changed files with 236 additions and 26 deletions.
4 changes: 2 additions & 2 deletions interop/xds/client/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,13 @@ COPY . .

# Build a static binary without cgo so that we can copy just the binary in the
# final image, and can get rid of Go compiler and gRPC-Go dependencies.
RUN go build -tags osusergo,netgo interop/xds/client/client.go
RUN cd interop/xds/client && go build -tags osusergo,netgo .

# Second stage of the build which copies over only the client binary and skips
# the Go compiler and gRPC repo from the earlier stage. This significantly
# reduces the docker image size.
FROM alpine
COPY --from=build /go/src/grpc-go/client .
COPY --from=build /go/src/grpc-go/interop/xds/client/client .
ENV GRPC_GO_LOG_VERBOSITY_LEVEL=99
ENV GRPC_GO_LOG_SEVERITY_LEVEL="info"
ENV GRPC_GO_LOG_FORMATTER="json"
Expand Down
72 changes: 60 additions & 12 deletions interop/xds/client/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@ import (
"fmt"
"log"
"net"
"net/http"
"os"
"strings"
"sync"
"sync/atomic"
Expand All @@ -35,15 +37,21 @@ import (
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/credentials/xds"
"google.golang.org/grpc/grpclog"
_ "google.golang.org/grpc/interop/xds" // to register Custom LB.
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/stats/opentelemetry"
"google.golang.org/grpc/stats/opentelemetry/csm"
"google.golang.org/grpc/status"
_ "google.golang.org/grpc/xds"

testgrpc "google.golang.org/grpc/interop/grpc_testing"
testpb "google.golang.org/grpc/interop/grpc_testing"
_ "google.golang.org/grpc/interop/xds" // to register Custom LB.

"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
)

func init() {
Expand Down Expand Up @@ -169,16 +177,19 @@ func (as *accumulatedStats) finishRPC(rpcType string, err error) {
}

var (
failOnFailedRPC = flag.Bool("fail_on_failed_rpc", false, "Fail client if any RPCs fail after first success")
numChannels = flag.Int("num_channels", 1, "Num of channels")
printResponse = flag.Bool("print_response", false, "Write RPC response to stdout")
qps = flag.Int("qps", 1, "QPS per channel, for each type of RPC")
rpc = flag.String("rpc", "UnaryCall", "Types of RPCs to make, ',' separated string. RPCs can be EmptyCall or UnaryCall. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcMetadata = flag.String("metadata", "", "The metadata to send with RPC, in format EmptyCall:key1:value1,UnaryCall:key2:value2. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcTimeout = flag.Duration("rpc_timeout", 20*time.Second, "Per RPC timeout")
server = flag.String("server", "localhost:8080", "Address of server to connect to")
statsPort = flag.Int("stats_port", 8081, "Port to expose peer distribution stats service")
secureMode = flag.Bool("secure_mode", false, "If true, retrieve security configuration from the management server. Else, use insecure credentials.")
failOnFailedRPC = flag.Bool("fail_on_failed_rpc", false, "Fail client if any RPCs fail after first success")
numChannels = flag.Int("num_channels", 1, "Num of channels")
printResponse = flag.Bool("print_response", false, "Write RPC response to stdout")
qps = flag.Int("qps", 1, "QPS per channel, for each type of RPC")
rpc = flag.String("rpc", "UnaryCall", "Types of RPCs to make, ',' separated string. RPCs can be EmptyCall or UnaryCall. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcMetadata = flag.String("metadata", "", "The metadata to send with RPC, in format EmptyCall:key1:value1,UnaryCall:key2:value2. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcTimeout = flag.Duration("rpc_timeout", 20*time.Second, "Per RPC timeout")
server = flag.String("server", "localhost:8080", "Address of server to connect to")
statsPort = flag.Int("stats_port", 8081, "Port to expose peer distribution stats service")
secureMode = flag.Bool("secure_mode", false, "If true, retrieve security configuration from the management server. Else, use insecure credentials.")
enableCSMObservability = flag.Bool("enable_csm_observability", false, "Whether to enable CSM Observability")
requestPayloadSize = flag.Int("request_payload_size", 0, "Ask the server to respond with SimpleResponse.payload.body of the given length (may not be implemented on the server).")
responsePayloadSize = flag.Int("response_payload_size", 0, "Ask the server to respond with SimpleResponse.payload.body of the given length (may not be implemented on the server).")

rpcCfgs atomic.Value

Expand Down Expand Up @@ -368,6 +379,35 @@ func parseRPCMetadata(rpcMetadataStr string, rpcs []string) []*rpcConfig {

func main() {
flag.Parse()
if *enableCSMObservability {
exporter, err := prometheus.New()
if err != nil {
logger.Fatalf("Failed to start prometheus exporter: %v", err)
}
provider := metric.NewMeterProvider(
metric.WithReader(exporter),
)
var addr string
var ok bool
if addr, ok = os.LookupEnv("OTEL_EXPORTER_PROMETHEUS_HOST"); !ok {
addr = ""
}
var port string
if port, ok = os.LookupEnv("OTEL_EXPORTER_PROMETHEUS_PORT"); !ok {
port = "9464"
}
go func() {
if err := http.ListenAndServe(addr+":"+port, promhttp.Handler()); err != nil {
logger.Fatalf("error listening: %v", err)
}
}()

ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
cleanup := csm.EnableObservability(ctx, opentelemetry.Options{MetricsOptions: opentelemetry.MetricsOptions{MeterProvider: provider}})
defer cleanup()
}

rpcCfgs.Store(parseRPCMetadata(*rpcMetadata, parseRPCTypes(*rpc)))

lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *statsPort))
Expand Down Expand Up @@ -430,8 +470,16 @@ func makeOneRPC(c testgrpc.TestServiceClient, cfg *rpcConfig) (*peer.Peer, *rpcI
accStats.startRPC(cfg.typ)
switch cfg.typ {
case unaryCall:
sr := &testpb.SimpleRequest{FillServerId: true}
if *requestPayloadSize > 0 {
sr.Payload = &testpb.Payload{Body: make([]byte, *requestPayloadSize)}
}
if *responsePayloadSize > 0 {
sr.ResponseSize = int32(*responsePayloadSize)
}
sr.ResponseSize = int32(*responsePayloadSize)
var resp *testpb.SimpleResponse
resp, err = c.UnaryCall(ctx, &testpb.SimpleRequest{FillServerId: true}, grpc.Peer(&p), grpc.Header(&header))
resp, err = c.UnaryCall(ctx, sr, grpc.Peer(&p), grpc.Header(&header))
// For UnaryCall, also read hostname from response, in case the server
// isn't updated to send headers.
if resp != nil {
Expand Down
46 changes: 46 additions & 0 deletions interop/xds/go.mod
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Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
module google.golang.org/grpc/interop/xds

go 1.21.0

replace google.golang.org/grpc => ../..

replace google.golang.org/grpc/stats/opentelemetry => ../../stats/opentelemetry

require (
github.com/prometheus/client_golang v1.19.1
go.opentelemetry.io/otel/exporters/prometheus v0.49.0
go.opentelemetry.io/otel/sdk/metric v1.27.0
google.golang.org/grpc v1.64.0
google.golang.org/grpc/stats/opentelemetry v0.0.0-20240523232201-f7d3d3eecbee
)

require (
cel.dev/expr v0.15.0 // indirect
cloud.google.com/go/compute/metadata v0.3.0 // indirect
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0 // indirect
github.com/beorn7/perks v1.0.1 // indirect
github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b // indirect
github.com/envoyproxy/go-control-plane v0.12.0 // indirect
github.com/envoyproxy/protoc-gen-validate v1.0.4 // indirect
github.com/go-logr/logr v1.4.2 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/golang/protobuf v1.5.4 // indirect
github.com/prometheus/client_model v0.6.1 // indirect
github.com/prometheus/common v0.53.0 // indirect
github.com/prometheus/procfs v0.15.0 // indirect
go.opentelemetry.io/contrib/detectors/gcp v1.27.0 // indirect
go.opentelemetry.io/otel v1.27.0 // indirect
go.opentelemetry.io/otel/metric v1.27.0 // indirect
go.opentelemetry.io/otel/sdk v1.27.0 // indirect
go.opentelemetry.io/otel/trace v1.27.0 // indirect
golang.org/x/net v0.25.0 // indirect
golang.org/x/oauth2 v0.20.0 // indirect
golang.org/x/sync v0.7.0 // indirect
golang.org/x/sys v0.20.0 // indirect
golang.org/x/text v0.15.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
google.golang.org/protobuf v1.34.1 // indirect
)
75 changes: 75 additions & 0 deletions interop/xds/go.sum
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Original file line number Diff line number Diff line change
@@ -0,0 +1,75 @@
cel.dev/expr v0.15.0 h1:O1jzfJCQBfL5BFoYktaxwIhuttaQPsVWerH9/EEKx0w=
cel.dev/expr v0.15.0/go.mod h1:TRSuuV7DlVCE/uwv5QbAiW/v8l5O8C4eEPHeu7gf7Sg=
cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0 h1:yRhWveg9NbJcJYoJL4FoSauT2dxnt4N9MIAJ7tvU/mQ=
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0/go.mod h1:p2puVVSKjQ84Qb1gzw2XHLs34WQyHTYFZLaVxypAFYs=
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/census-instrumentation/opencensus-proto v0.4.1 h1:iKLQ0xPNFxR/2hzXZMrBo8f1j86j5WHzznCCQxV/b8g=
github.com/census-instrumentation/opencensus-proto v0.4.1/go.mod h1:4T9NM4+4Vw91VeyqjLS6ao50K5bOcLKN6Q42XnYaRYw=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b h1:ga8SEFjZ60pxLcmhnThWgvH2wg8376yUJmPhEH4H3kw=
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/envoyproxy/go-control-plane v0.12.0 h1:4X+VP1GHd1Mhj6IB5mMeGbLCleqxjletLK6K0rbxyZI=
github.com/envoyproxy/go-control-plane v0.12.0/go.mod h1:ZBTaoJ23lqITozF0M6G4/IragXCQKCnYbmlmtHvwRG0=
github.com/envoyproxy/protoc-gen-validate v1.0.4 h1:gVPz/FMfvh57HdSJQyvBtF00j8JU4zdyUgIUNhlgg0A=
github.com/envoyproxy/protoc-gen-validate v1.0.4/go.mod h1:qys6tmnRsYrQqIhm2bvKZH4Blx/1gTIZ2UKVY1M+Yew=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
github.com/prometheus/common v0.53.0 h1:U2pL9w9nmJwJDa4qqLQ3ZaePJ6ZTwt7cMD3AG3+aLCE=
github.com/prometheus/common v0.53.0/go.mod h1:BrxBKv3FWBIGXw89Mg1AeBq7FSyRzXWI3l3e7W3RN5U=
github.com/prometheus/procfs v0.15.0 h1:A82kmvXJq2jTu5YUhSGNlYoxh85zLnKgPz4bMZgI5Ek=
github.com/prometheus/procfs v0.15.0/go.mod h1:Y0RJ/Y5g5wJpkTisOtqwDSo4HwhGmLB4VQSw2sQJLHk=
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
go.opentelemetry.io/contrib/detectors/gcp v1.27.0 h1:eVfDeFAPnMFZUhNdDZ/BbpEmC7/xxDKTSba5NhJH88s=
go.opentelemetry.io/contrib/detectors/gcp v1.27.0/go.mod h1:amd+4uZxqJAUx7zI1JvygUtAc2EVWtQeyz8D+3161SQ=
go.opentelemetry.io/otel v1.27.0 h1:9BZoF3yMK/O1AafMiQTVu0YDj5Ea4hPhxCs7sGva+cg=
go.opentelemetry.io/otel v1.27.0/go.mod h1:DMpAK8fzYRzs+bi3rS5REupisuqTheUlSZJ1WnZaPAQ=
go.opentelemetry.io/otel/exporters/prometheus v0.49.0 h1:Er5I1g/YhfYv9Affk9nJLfH/+qCCVVg1f2R9AbJfqDQ=
go.opentelemetry.io/otel/exporters/prometheus v0.49.0/go.mod h1:KfQ1wpjf3zsHjzP149P4LyAwWRupc6c7t1ZJ9eXpKQM=
go.opentelemetry.io/otel/metric v1.27.0 h1:hvj3vdEKyeCi4YaYfNjv2NUje8FqKqUY8IlF0FxV/ik=
go.opentelemetry.io/otel/metric v1.27.0/go.mod h1:mVFgmRlhljgBiuk/MP/oKylr4hs85GZAylncepAX/ak=
go.opentelemetry.io/otel/sdk v1.27.0 h1:mlk+/Y1gLPLn84U4tI8d3GNJmGT/eXe3ZuOXN9kTWmI=
go.opentelemetry.io/otel/sdk v1.27.0/go.mod h1:Ha9vbLwJE6W86YstIywK2xFfPjbWlCuwPtMkKdz/Y4A=
go.opentelemetry.io/otel/sdk/metric v1.27.0 h1:5uGNOlpXi+Hbo/DRoI31BSb1v+OGcpv2NemcCrOL8gI=
go.opentelemetry.io/otel/sdk/metric v1.27.0/go.mod h1:we7jJVrYN2kh3mVBlswtPU22K0SA+769l93J6bsyvqw=
go.opentelemetry.io/otel/trace v1.27.0 h1:IqYb813p7cmbHk0a5y6pD5JPakbVfftRXABGt5/Rscw=
go.opentelemetry.io/otel/trace v1.27.0/go.mod h1:6RiD1hkAprV4/q+yd2ln1HG9GoPx39SuvvstaLBl+l4=
golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
golang.org/x/oauth2 v0.20.0 h1:4mQdhULixXKP1rwYBW0vAijoXnkTG0BLCDRzfe1idMo=
golang.org/x/oauth2 v0.20.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 h1:7whR9kGa5LUwFtpLm2ArCEejtnxlGeLbAyjFY8sGNFw=
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157/go.mod h1:99sLkeliLXfdj2J75X3Ho+rrVCaJze0uwN7zDDkjPVU=
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 h1:Zy9XzmMEflZ/MAaA7vNcoebnRAld7FsPW1EeBB7V0m8=
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
6 changes: 3 additions & 3 deletions interop/xds/server/Dockerfile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,13 @@ COPY . .

# Build a static binary without cgo so that we can copy just the binary in the
# final image, and can get rid of the Go compiler and gRPC-Go dependencies.
RUN go build -tags osusergo,netgo interop/xds/server/server.go
RUN cd interop/xds/server && go build -tags osusergo,netgo .

# Second stage of the build which copies over only the client binary and skips
# Second stage of the build which copies over only the server binary and skips
# the Go compiler and gRPC repo from the earlier stage. This significantly
# reduces the docker image size.
FROM alpine
COPY --from=build /go/src/grpc-go/server .
COPY --from=build /go/src/grpc-go/interop/xds/server/server .
ENV GRPC_GO_LOG_VERBOSITY_LEVEL=99
ENV GRPC_GO_LOG_SEVERITY_LEVEL="info"
ENV GRPC_GO_LOG_FORMATTER="json"
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