docs: update otel related information

docs/user-guide/nginx-configuration/configmap.md

@@ -164,16 +164,16 @@ The following table shows a configuration option's name, type, and the default v
 |[enable-opentelemetry](#enable-opentelemetry)|bool|"false"||
 |[opentelemetry-trust-incoming-span](#opentelemetry-trust-incoming-span)|bool|"true"||
 |[opentelemetry-operation-name](#opentelemetry-operation-name)|string|""||
-|[opentelemetry-config](#/etc/ingress-controller/telemetry/opentelemetry.toml)|string|"/etc/ingress-controller/telemetry/opentelemetry.toml"||
+|[opentelemetry-config](#/etc/nginx/opentelemetry.toml)|string|"/etc/nginx/opentelemetry.toml"||
 |[otlp-collector-host](#otlp-collector-host)|string|""||
 |[otlp-collector-port](#otlp-collector-port)|int|4317||
-|[otel-max-queuesize](#otel-max-queuesize)|int|||
-|[otel-schedule-delay-millis](#otel-schedule-delay-millis)|int|||
-|[otel-max-export-batch-size](#otel-max-export-batch-size)|int|||
-|[otel-service-name](#otel-service-name)|string|"nginx"||
-|[otel-sampler](#otel-sampler)|string|"AlwaysOff"||
+|[otel-max-export-batch-size](#otel-max-export-batch-size)|int|512||
+|[otel-max-queuesize](#otel-max-queuesize)|int|2048||
 |[otel-sampler-parent-based](#otel-sampler-parent-based)|bool|"false"||
 |[otel-sampler-ratio](#otel-sampler-ratio)|float|0.01||
+|[otel-sampler](#otel-sampler)|string|"AlwaysOn"||
+|[otel-schedule-delay-millis](#otel-schedule-delay-millis)|int|5000||
+|[otel-service-name](#otel-service-name)|string|"nginx"||
 |[main-snippet](#main-snippet)|string|""||
 |[http-snippet](#http-snippet)|string|""||
 |[server-snippet](#server-snippet)|string|""||
@@ -1089,10 +1089,23 @@ Specifies the port to use when uploading traces. _**default:**_ 4317
 
 Specifies the service name to use for any traces created. _**default:**_ nginx
 
-##  opentelemetry-trust-incoming-span: "true"
+## opentelemetry-trust-incoming-span:
+
 Enables or disables using spans from incoming requests as parent for created ones. _**default:**_ true
 
-##  otel-sampler-parent-based
+## otel-max-export-batch-size
+
+The maximum batch size. Must be equal or smaller than [otel-max-export-batch-size](#otel-max-export-batch-size). _**default:**_ 512
+
+## otel-schedule-delay-millis
+
+The interval, in milliseconds, between two consecutive exports. _**default:**_ 5000
+
+## otel-max-queuesize
+
+The maximum queue size. _**default:**_ 2048
+
+## otel-sampler-parent-based
 
 Uses sampler implementation which by default will take a sample if parent Activity is sampled. _**default:**_ false
 
@@ -1104,6 +1117,8 @@ Specifies sample rate for any traces created. _**default:**_ 0.01
 
 Specifies the sampler to be used when sampling traces. The available samplers are: AlwaysOff, AlwaysOn, TraceIdRatioBased, remote. _**default:**_ AlwaysOff
 
+AlwaysOn is equivalent to setting [otel-sampler-ratio](#otel-sampler-ratio) to "1" and otel-sampler to "TraceIdRatioBased".
+
 ## main-snippet
 
 Adds custom configuration to the main section of the nginx configuration.

internal/ingress/controller/config/config.go

@@ -888,10 +888,10 @@ func NewDefault() Configuration {
 		BindAddressIpv4:                        defBindAddress,
 		BindAddressIpv6:                        defBindAddress,
 		OpentelemetryTrustIncomingSpan:         true,
-		OpentelemetryConfig:                    "/etc/ingress-controller/telemetry/opentelemetry.toml",
+		OpentelemetryConfig:                    "/etc/nginx/opentelemetry.toml",
 		OtlpCollectorPort:                      "4317",
 		OtelServiceName:                        "nginx",
-		OtelSampler:                            "AlwaysOn",
+		OtelSampler:                            "AlwaysOff",
 		OtelSamplerRatio:                       0.01,
 		OtelSamplerParentBased:                 true,
 		OtelScheduleDelayMillis:                5000,

internal/ingress/controller/nginx.go

@@ -1014,7 +1014,7 @@ max_export_batch_size = {{ .OtelMaxExportBatchSize }}
 name = "{{ .OtelServiceName }}" # Opentelemetry resource name
 
 [sampler]
-name = "{{ .OtelSampler }}" # Also: AlwaysOff, TraceIdRatioBased
+name = "{{ .OtelSampler }}" # Also: AlwaysOn, AlwaysOff, TraceIdRatioBased
 ratio = {{ .OtelSamplerRatio }}
 parent_based = {{ .OtelSamplerParentBased }}
 `