added scylla prom example

collector/scylla/examples/compose/README.md

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+# Scylla metrics using the OpenTelemetry Collector
+
+## Overview
+
+ Name: natively exposes a Prometheus endpoint and the OpenTelemetry Collector has a [Prometheus receiver][otel-prom-receiver] that can be used to scrape its Prometheus endpoint. This directory contains an example showing how to configure Name: and the Collector to send metrics to Lightstep Observability.
+
+## Prerequisites
+
+* Docker
+* Docker Compose
+* A Lightstep Observability [access token][ls-docs-access-token]
+
+## How to run the example
+
+* Export your Lightstep access token
+
+  ```sh
+  export LS_ACCESS_TOKEN=<YOUR_TOKEN>
+  ```
+
+* Run the docker compose example
+
+  ```sh
+  docker-compose up -d
+  ```
+
+### Explore Metrics in Lightstep
+
+See the [Name: Telemetry Docs][scylla-docs-telemetry] for comprehensive documentation on metrics emitted and the [dashboard documentation][ls-docs-dashboards] for more details.
+
+## Configure the Collector
+
+Below is a snippet showing how to configure the Prometheus Receiver to scrape the Prometheus endpoint exposed by the Name: Server.
+
+```yaml
+receivers:
+  prometheus:
+    config:
+      scrape_configs:
+        - job_name: 'scylladb'
+          scrape_interval: 10s
+          static_configs:
+            - targets: ['localhost:9180']
+```
+
+
+## Additional information
+
+- [OpenTelemetry Collector Prometheus Receiver][otel-prom-receiver]
+- [Name: Telemetry Reference][scylla-docs-telemetry]
+
+[ls-docs-access-token]: https://docs.lightstep.com/docs/create-and-manage-access-tokens
+[ls-docs-dashboards]: https://docs.lightstep.com/docs/create-and-manage-dashboards
+[otel-prom-receiver]: https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/receiver/prometheusreceiver
+[scylla-docs-telemetry]: https://cloud.docs.scylladb.com/stable/monitoring/cloud-prom-proxy.html

collector/scylla/examples/compose/collector.yaml

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+receivers:
+  prometheus:
+    config:
+      scrape_configs:
+        - job_name: 'scylladb'
+          scrape_interval: 10s
+          static_configs:
+            - targets: ['scylladb:9180']
+
+processors:
+  batch:
+
+exporters:
+  logging:
+    loglevel: debug
+  otlp:
+    endpoint: ingest.staging.lightstep.com:443
+    headers:
+      - lightstep-access-token: ${LS_ACCESS_TOKEN}
+
+service:
+  pipelines:
+    metrics:
+      receivers: [prometheus]
+      processors: [batch]
+      exporters: [logging,otlp]

collector/scylla/examples/compose/docker-compose.yaml

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+version: '3.7'
+services:
+  scylladb:
+    container_name: scylladb
+    image: scylladb/scylla:latest
+    ports:
+      - "9042:9042"
+
+  otel-collector:
+    container_name: otel-collector
+    image: otel/opentelemetry-collector-contrib:0.81.0
+    hostname: otel-collector
+    restart: always
+    command: [ "--config=/conf/collector.yaml" ]
+    volumes:
+      - ./collector.yaml:/conf/collector.yaml:rw
+    environment:
+      LS_ACCESS_TOKEN: "${LS_ACCESS_TOKEN}"