update otel docs

Signed-off-by: Amy Tobey <[email protected]>

README.md

@@ -72,26 +72,24 @@ The most interesting targets are `make all` (or just `make`) and `make images`.
 
 Rather than adding a bunch of command line options or a config file, OpenTelemetry
 is configured via environment variables. The most relevant ones are below, for others
-see https://github.com/tobert/otel-launcher-go/tree/temp-hack-for-tinkerbell-prs
+see https://github.com/equinix-labs/otel-init-go
 
 Notes:
-   * we're using a branch of Lightstep's otel-launcher-go modified to work with any OTLP provider
    * currently this is just for tracing, metrics needs to be discussed with the community
 
-| Env Variable                      | Required | Default   |
-|-----------------------------------|----------|---------- |
-|`OTEL_EXPORTER_OTLP_SPAN_ENDPOINT` | n        | localhost |
-|`OTEL_EXPORTER_OTLP_SPAN_INSECURE` | n        | false     |
-|`OTEL_EXPORTER_OTLP_HEADERS`       | n        | {}        |
-|`OTEL_LOG_LEVEL`                   | n        | info      |
+| Env Variable                 | Required | Default   |
+|------------------------------|----------|---------- |
+|`OTEL_EXPORTER_OTLP_ENDPOINT` | n        | localhost |
+|`OTEL_EXPORTER_OTLP_INSECURE` | n        | false     |
+|`OTEL_LOG_LEVEL`              | n        | info      |
 
 To work with a local [opentelemetry-collector](https://github.com/open-telemetry/opentelemetry-collector),
 try the following. For examples of how to set up the collector to relay to various services
 take a look at [otel-cli](https://github.com/packethost/otel-cli)
 
 ```
-export OTEL_EXPORTER_OTLP_SPAN_ENDPOINT=localhost
-export OTEL_EXPORTER_OTLP_SPAN_INSECURE=true
+export OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317
+export OTEL_EXPORTER_OTLP_INSECURE=true
 ./cmd/tink-server/tink-server <stuff>
 ```