update readme on how to use OTEL_NODE_RESOURCE_DETECTORS

experimental/packages/opentelemetry-sdk-node/README.md

@@ -115,9 +115,25 @@ Configure a resource. Resources may also be detected by using the `autoDetectRes
 
 ### resourceDetectors
 
-Configure resource detectors. By default, the resource detectors are [envDetector, processDetector].
+Configure resource detectors. By default, the resource detectors are [envDetector, processDetector, hostDetector].
 NOTE: In order to enable the detection, the parameter `autoDetectResources` has to be `true`.
 
+You can also use the environment variable `OTEL_NODE_RESOURCE_DETECTORS` to enable only certain detectors, or completely disable them:
+
+- `env`
+- `host`
+- `os`
+- `process`
+- `serviceinstance`
+- `all` - enable all resource detectors above
+- `none` - disable resource detection
+
+For example, to enable only the `env`, `host` detectors:
+
+```shell
+export OTEL_NODE_RESOURCE_DETECTORS="env,host"
+```
+
 ### sampler
 
 Configure a custom sampler. By default, all traces will be sampled.

packages/opentelemetry-resources/README.md

@@ -16,11 +16,11 @@ npm install --save @opentelemetry/resources
 ## Usage
 
 ```typescript
-import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
+import { SEMRESATTRS_SERVICE_NAME } from '@opentelemetry/semantic-conventions';
 import { Resource } from '@opentelemetry/resources';
 
 const resource = new Resource({
-    [SemanticResourceAttributes.SERVICE_NAME]: 'api-service',
+    [SEMRESATTRS_SERVICE_NAME]: 'api-service',
 });
 
 const anotherResource = new Resource({