Fixed linting and the wrong key name for api token

.env.example

@@ -4,11 +4,16 @@
 # to be appended to the GRAFANA_OTLP_ENDPOINT in order to work.
 # You get the following error
 # Transient error StatusCode.UNAVAILABLE encountered while exporting metrics to otlp-gateway-prod-us-west-0.grafana.net, retrying in 1s.
-#  other iwse
-GRAFANA_OTLP_USERNAME = '<Grafana Cloud Instance ID'
-# use
-# `echo -n "<your user id>:<your api key>" | base64 -w0`
-GRAFANA_OTLP_USERNAME = 'Grafana User ID'
-GRAFANA_OTLP_API_ENCODED_TOKEN = '<Grafana Cloud API Token>'
-GRAFANA_OTLP_ENDPOINT = "<Grafana Cloud OTLP Gateway Endpoint for your Grafana Instance"
-OTEL_PYTHON_LOG_CORRELATION = "true"
+#  otherwise
+# We should switch to more standard OTEL_EXPORTER_OTLP_HEADERS
+# For now use the Grafana API TOKEN as is.
+# See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/
+GRAFANA_OTLP_API_TOKEN='<Grafana Cloud API Token>'
+# we would use the standard OpenTelemetry environmental variables if not for the
+# `/v1/traces`, `/v1/metrics`, `/v1/logs` that needs to added for
+# tracing, metrics and logs endpoints
+# See https://grafana.com/docs/opentelemetry/instrumentation/configuration/environment-variables/
+# The standard is OTEL_EXPORTER_OTLP_ENDPOINT
+GRAFANA_OTLP_ENDPOINT="<Grafana Cloud OTLP Gateway Endpoint for your Grafana Instance"
+GRAFANA_OTLP_USERNAME='<Grafana Cloud Instance ID'
+OTEL_PYTHON_LOG_CORRELATION="true"