use IPv4

CONTRIBUTING.md

@@ -24,7 +24,7 @@ If a test case fails (let's say `examples/nodejs`), follow these steps:
 
 1. Build a new image: `mise run build-lgtm dev1`
 2. `oats -timeout 2h -lgtm-version dev1 examples/nodejs` (automatically installed by `mise`)
-3. go to <http://localhost:3000>
+3. go to <http://127.0.0.1:3000>
 
 You can run all everything together using `mise run test`.
 

README.md

@@ -48,7 +48,7 @@ mise run lgtm
 You can enable logging for troubleshooting:
 
 | Environment Variable     | Enables Logging in:     |
-| ------------------------ | ----------------------- |
+|--------------------------|-------------------------|
 | `ENABLE_LOGS_GRAFANA`    | Grafana                 |
 | `ENABLE_LOGS_LOKI`       | Loki                    |
 | `ENABLE_LOGS_PROMETHEUS` | Prometheus              |
@@ -105,12 +105,12 @@ There's no need to configure anything: the Docker image works with OpenTelemetry
 ```sh
 # Not needed, but these are the defaults in OpenTelemetry
 export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
-export OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
+export OTEL_EXPORTER_OTLP_ENDPOINT=http://127.0.0.1:4318
 ```
 
 ## View Grafana
 
-Navigate to <http://localhost:3000> and log in with the default built-in user `admin` and password `admin`.
+Navigate to <http://127.0.0.1:3000> and log in with the default built-in user `admin` and password `admin`.
 
 ## Build the Docker image from scratch
 
@@ -183,12 +183,12 @@ Each example uses a different application port
 (to be able to run all applications at the same time).
 
 | Example | Service URL                           |
-| ------- | ------------------------------------- |
-| Java    | `curl http://localhost:8080/rolldice` |
-| Go      | `curl http://localhost:8081/rolldice` |
-| Python  | `curl http://localhost:8082/rolldice` |
-| .NET    | `curl http://localhost:8083/rolldice` |
-| Node.js | `curl http://localhost:8084/rolldice` |
+|---------|---------------------------------------|
+| Java    | `curl http://127.0.0.1:8080/rolldice` |
+| Go      | `curl http://127.0.0.1:8081/rolldice` |
+| Python  | `curl http://127.0.0.1:8082/rolldice` |
+| .NET    | `curl http://127.0.0.1:8083/rolldice` |
+| Node.js | `curl http://127.0.0.1:8084/rolldice` |
 
 ## Related Work
 

docker/grafana-datasources.yaml

@@ -4,7 +4,7 @@ datasources:
   - name: Prometheus
     type: prometheus
     uid: prometheus
-    url: http://localhost:9090
+    url: http://127.0.0.1:9090
     editable: true
     jsonData:
       timeInterval: 60s
@@ -16,7 +16,7 @@ datasources:
   - name: Tempo
     type: tempo
     uid: tempo
-    url: http://localhost:3200
+    url: http://127.0.0.1:3200
     editable: true
     jsonData:
       tracesToLogsV2:
@@ -39,7 +39,7 @@ datasources:
   - name: Loki
     type: loki
     uid: loki
-    url: http://localhost:3100
+    url: http://127.0.0.1:3100
     editable: true
     jsonData:
       derivedFields:
@@ -53,4 +53,4 @@ datasources:
   - name: Pyroscope
     type: grafana-pyroscope-datasource
     uid: pyroscope
-    url: http://localhost:4040
+    url: http://127.0.0.1:4040

docker/loki-config.yaml

@@ -26,7 +26,7 @@ schema_config:
         period: 24h
 
 ruler:
-  alertmanager_url: http://localhost:9093
+  alertmanager_url: http://127.0.0.1:9093
 
 pattern_ingester:
   lifecycler:

docker/otelcol-config.yaml

@@ -14,7 +14,7 @@ receivers:
         - job_name: "opentelemetry-collector"
           scrape_interval: 1s
           static_configs:
-            - targets: ["localhost:8888"]
+            - targets: ["127.0.0.1:8888"]
 
 extensions:
   health_check:
@@ -26,19 +26,19 @@ processors:
 
 exporters:
   otlphttp/metrics:
-    endpoint: http://localhost:9090/api/v1/otlp
+    endpoint: http://127.0.0.1:9090/api/v1/otlp
     tls:
       insecure: true
   otlphttp/traces:
-    endpoint: http://localhost:4418
+    endpoint: http://127.0.0.1:4418
     tls:
       insecure: true
   otlphttp/logs:
-    endpoint: http://localhost:3100/otlp
+    endpoint: http://127.0.0.1:3100/otlp
     tls:
       insecure: true
   otlp/profiles:
-    endpoint: http://localhost:4040
+    endpoint: http://127.0.0.1:4040
     tls:
       insecure: true
   debug/metrics:

docker/run-all.sh

@@ -38,12 +38,12 @@ declare -A service_ready elapsed_times
 
 # Define services and their health check URLs
 declare -A services
-services["grafana"]="http://localhost:3000/api/health"
-services["loki"]="http://localhost:3100/ready"
-services["prometheus"]="http://localhost:9090/api/v1/status/runtimeinfo"
-services["tempo"]="http://localhost:3200/ready"
-services["pyroscope"]="http://localhost:4040/ready"
-services["otelcol"]="http://localhost:13133/ready"
+services["grafana"]="http://127.0.0.1:3000/api/health"
+services["loki"]="http://127.0.0.1:3100/ready"
+services["prometheus"]="http://127.0.0.1:9090/api/v1/status/runtimeinfo"
+services["tempo"]="http://127.0.0.1:3200/ready"
+services["pyroscope"]="http://127.0.0.1:4040/ready"
+services["otelcol"]="http://127.0.0.1:13133/ready"
 
 # Initialize service_ready status to false for all services
 for service in "${!services[@]}"; do

docker/tempo-config.yaml

@@ -7,9 +7,9 @@ distributor:
     otlp:
       protocols:
         grpc:
-          endpoint: "localhost:4417"
+          endpoint: "127.0.0.1:4417"
         http:
-          endpoint: "localhost:4418"
+          endpoint: "127.0.0.1:4418"
 
 ingester:
   trace_idle_period: 1s
@@ -25,7 +25,7 @@ ingester:
 
 querier:
   frontend_worker:
-    frontend_address: localhost:9096
+    frontend_address: 127.0.0.1:9096
 
 storage:
   trace:
@@ -49,7 +49,7 @@ metrics_generator:
   storage:
     path: /data/tempo/generator/wal
     remote_write:
-      - url: http://localhost:9090/api/v1/write
+      - url: http://127.0.0.1:9090/api/v1/write
         send_exemplars: true
 
 overrides:

examples/dotnet/Program.cs

@@ -13,7 +13,7 @@
     serviceVersion: typeof(Program).Assembly.GetName().Version?.ToString() ?? "unknown",
     serviceInstanceId: Environment.MachineName);
 
-const string DefaultEndpoint = "http://localhost:4317";
+const string DefaultEndpoint = "http://127.0.0.1:4317";
 
 // Configure OpenTelemetry tracing and metrics with auto-start using the
 // AddOpenTelemetry() extension method from the OpenTelemetry.Extensions.Hosting package.

examples/dotnet/Properties/launchSettings.json

@@ -5,7 +5,7 @@
       "commandName": "Project",
       "dotnetRunMessages": true,
       "launchBrowser": true,
-      "applicationUrl": "http://localhost:8083/rolldice"
+      "applicationUrl": "http://127.0.0.1:8083/rolldice"
     }
   }
 }

examples/dotnet/appsettings.json

@@ -23,6 +23,6 @@
     }
   },
   "Otlp": {
-    "Endpoint": "http://localhost:4317"
+    "Endpoint": "http://127.0.0.1:4317"
   }
 }

examples/ebpf-profiler/README.md

@@ -40,4 +40,4 @@ Navigate to the [Pyroscope UI][Pyroscope UI] to visualize the profiles.
 <!-- editorconfig-checker-disable -->
 <!-- markdownlint-disable MD013 -->
 
-[Pyroscope UI]: http://localhost:3000/a/grafana-pyroscope-app/explore?searchText=&panelType=time-series&layout=grid&hideNoData=off&explorationType=flame-graph&var-serviceName=unknown&var-profileMetricId=process_cpu:cpu:nanoseconds:cpu:nanoseconds&var-spanSelector=undefined&var-dataSource=pyroscope&var-filters=&var-filtersBaseline=&var-filtersComparison=&var-groupBy=all&maxNodes=16384
+[Pyroscope UI]: http://127.0.0.1:3000/a/grafana-pyroscope-app/explore?searchText=&panelType=time-series&layout=grid&hideNoData=off&explorationType=flame-graph&var-serviceName=unknown&var-profileMetricId=process_cpu:cpu:nanoseconds:cpu:nanoseconds&var-spanSelector=undefined&var-dataSource=pyroscope&var-filters=&var-filtersBaseline=&var-filtersComparison=&var-groupBy=all&maxNodes=16384

examples/go/run.sh

@@ -3,7 +3,7 @@
 set -euo pipefail
 
 export OTEL_METRIC_EXPORT_INTERVAL="5000" # so we don't have to wait 60s for metrics
-export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=localhost:8081"
+export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=127.0.0.1:8081"
 
 # Run the application
 # use http instead of https (needed because of https://github.com/open-telemetry/opentelemetry-go/issues/4834)

examples/java/json-logging-ecs/README.md

@@ -5,6 +5,6 @@
 1. Build the Docker image using using `build.sh`
 2. Deploy the manifest using `kubectl apply -f k8s/` (e.g. using [k3d.sh](k3d.sh))
 3. Generate traffic using [generate-traffic.sh](../../../generate-traffic.sh)
-4. Log in to [http://localhost:3000](http://localhost:3000) with user _admin_ and password _admin_.
+4. Log in to [http://127.0.0.1:3000](http://127.0.0.1:3000) with user _admin_ and password _admin_.
 5. Go to "Explore"
 6. Select "Loki" as data source

examples/java/json-logging-ecs/k8s/collector-configmap.yaml

@@ -16,7 +16,7 @@ data:
           scrape_configs:
             - job_name: 'opentelemetry-collector'
               static_configs:
-                - targets: [ 'localhost:8888' ]
+                - targets: [ '127.0.0.1:8888' ]
       filelog/json-ecs:
         include:
           - /var/log/pods/*/*/*.log
@@ -136,11 +136,11 @@ data:
 
     exporters:
       otlphttp/metrics:
-        endpoint: http://localhost:9090/api/v1/otlp
+        endpoint: http://127.0.0.1:9090/api/v1/otlp
       otlphttp/traces:
-        endpoint: http://localhost:4418
+        endpoint: http://127.0.0.1:4418
       otlphttp/logs:
-        endpoint: http://localhost:3100/otlp
+        endpoint: http://127.0.0.1:3100/otlp
       debug/metrics:
         verbosity: detailed
       debug/traces:

examples/java/json-logging-logback/README.md

@@ -5,6 +5,6 @@
 1. Build the Docker image using using `build.sh`
 2. Deploy the manifest using `kubectl apply -f k8s/` (e.g. using [k3d.sh](k3d.sh))
 3. Generate traffic using [generate-traffic.sh](../../../generate-traffic.sh)
-4. Log in to [http://localhost:3000](http://localhost:3000) with user _admin_ and password _admin_.
+4. Log in to [http://127.0.0.1:3000](http://127.0.0.1:3000) with user _admin_ and password _admin_.
 5. Go to "Explore"
 6. Select "Loki" as data source

examples/java/json-logging-logback/k8s/collector-configmap.yaml

@@ -17,7 +17,7 @@ data:
           scrape_configs:
             - job_name: 'opentelemetry-collector'
               static_configs:
-                - targets: [ 'localhost:8888' ]
+                - targets: [ '127.0.0.1:8888' ]
       filelog/json-logback:
         include:
           - /var/log/pods/*/*/*.log
@@ -145,11 +145,11 @@ data:
 
     exporters:
       otlphttp/metrics:
-        endpoint: http://localhost:9090/api/v1/otlp
+        endpoint: http://127.0.0.1:9090/api/v1/otlp
       otlphttp/traces:
-        endpoint: http://localhost:4418
+        endpoint: http://127.0.0.1:4418
       otlphttp/logs:
-        endpoint: http://localhost:3100/otlp
+        endpoint: http://127.0.0.1:3100/otlp
       debug/metrics:
         verbosity: detailed
       debug/traces:

examples/java/json-logging-otlp/README.md

@@ -5,6 +5,6 @@
 1. Build the Docker image using using `build.sh`
 2. Deploy the manifest using `kubectl apply -f k8s/` (e.g. using [k3d.sh](k3d.sh))
 3. Generate traffic using [generate-traffic.sh](../../../generate-traffic.sh)
-4. Log in to [http://localhost:3000](http://localhost:3000) with user _admin_ and password _admin_.
+4. Log in to [http://127.0.0.1:3000](http://127.0.0.1:3000) with user _admin_ and password _admin_.
 5. Go to "Explore"
 6. Select "Loki" as data source

examples/java/json-logging-otlp/k8s/collector-configmap.yaml

@@ -37,11 +37,11 @@ data:
 
     exporters:
       otlphttp/metrics:
-        endpoint: http://localhost:9090/api/v1/otlp
+        endpoint: http://127.0.0.1:9090/api/v1/otlp
       otlphttp/traces:
-        endpoint: http://localhost:4418
+        endpoint: http://127.0.0.1:4418
       otlphttp/logs:
-        endpoint: http://localhost:3100/otlp
+        endpoint: http://127.0.0.1:3100/otlp
       debug/metrics:
         verbosity: detailed
       debug/traces:

examples/java/run.cmd

@@ -10,7 +10,7 @@ if not exist ./%jar% (
     curl -sL https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/%version%/opentelemetry-javaagent.jar -o %jar%
 )
 
-set OTEL_RESOURCE_ATTRIBUTES=service.name=rolldice,service.instance.id=localhost:8080
+set OTEL_RESOURCE_ATTRIBUTES=service.name=rolldice,service.instance.id=127.0.0.1:8080
 @REM uncomment the next line to switch to Prometheus native histograms.
 @REM set OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION=base2_exponential_bucket_histogram
 java -Dotel.metric.export.interval=500 -Dotel.bsp.schedule.delay=500 -javaagent:%jar% -jar ./target/rolldice.jar

examples/java/run.sh

@@ -13,7 +13,7 @@ if [[ ! -f ./${jar} ]]; then
 	curl -vL https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v${opentelemetry_javaagent_version}/opentelemetry-javaagent.jar -o ${jar} # editorconfig-checker-disable-line
 
 fi
-export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=localhost:8080"
+export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=127.0.0.1:8080"
 # uncomment the next line to switch to Prometheus native histograms.
 # export OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION=base2_exponential_bucket_histogram
 java -Dotel.metric.export.interval=500 -Dotel.bsp.schedule.delay=500 -javaagent:${jar} -jar ./target/rolldice.jar

examples/nodejs/app.js

@@ -32,5 +32,5 @@ app.get('/rolldice', (req, res) => {
 })
 
 app.listen(PORT, () => {
-  console.log(`Listening for requests on http://localhost:${PORT}`)
+  console.log(`Listening for requests on http://127.0.0.1:${PORT}`)
 })

examples/python/run.sh

@@ -3,7 +3,7 @@
 set -euo pipefail
 
 export OTEL_METRIC_EXPORT_INTERVAL="5000" # so we don't have to wait 60s for metrics
-export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=localhost:8082"
+export OTEL_RESOURCE_ATTRIBUTES="service.name=rolldice,service.instance.id=127.0.0.1:8082"
 
 python3 -m venv venv
 # shellcheck disable=SC1091

generate-traffic.cmd

@@ -1,10 +1,10 @@
 @ECHO OFF
 :loop
 	cls
-	curl -s http://localhost:8080/rolldice
-	curl -s http://localhost:8081/rolldice
-	curl -s http://localhost:8082/rolldice
-	curl -s http://localhost:8083/rolldice
-	curl -s http://localhost:8084/rolldice
+	curl -s http://127.0.0.1:8080/rolldice
+	curl -s http://127.0.0.1:8081/rolldice
+	curl -s http://127.0.0.1:8082/rolldice
+	curl -s http://127.0.0.1:8083/rolldice
+	curl -s http://127.0.0.1:8084/rolldice
 	timeout /t 2
 goto loop

generate-traffic.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-watch 'curl -s http://localhost:8080/rolldice; \
-  curl -s http://localhost:8081/rolldice; \
-  curl -s http://localhost:8082/rolldice; \
-  curl -s http://localhost:8083/rolldice; \
-  curl -s http://localhost:8084/rolldice?rolls=5'
+watch 'curl -s http://127.0.0.1:8080/rolldice; \
+  curl -s http://127.0.0.1:8081/rolldice; \
+  curl -s http://127.0.0.1:8082/rolldice; \
+  curl -s http://127.0.0.1:8083/rolldice; \
+  curl -s http://127.0.0.1:8084/rolldice?rolls=5'