Add docker+syslog+otel-collector tutorial

docs/log-management/send-logs/send-docker-logs-syslog.md

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+---
+title: Send docker logs into Q (using syslog)
+sidebar_label: Docker syslog config
+description: Send docker logs into Quickwit
+tags: [otel, docker, collector, log]
+sidebar_position: 5
+---
+
+To send docker container logs into Quickwit, you just need to setup an OpenTelemetry Collector with the file logs receiver. In this tutorial, we will use `docker compose` to start the collector and Quickwit.
+
+You only need a minute to get your Quickwit log UI!
+
+![Quickwit UI Logs](../../assets/images/screenshot-quickwit-ui-docker-compose-logs.png)
+
+## OTEL collector configuration
+
+The following collector configuration will listen to RFC5424-compliant logs transmitted by docker over tcp, parse them and send them to Quickwit through gRPC at `http://quickwit:7281`.
+
+```yaml title="otel-collector-config.yaml"
+receivers:
+  syslog:
+    tcp:
+      listen_address: 0.0.0.0:54526
+    protocol: rfc5424
+    operators:
+      - id: extract_metadata_from_docker_tag
+        parse_from: attributes.appname
+        regex: 'docker/(?P<container_name>\w+)'
+        type: regex_parser
+        if: 'attributes?.appname != nil'
+
+processors:
+  batch:
+    timeout: 5s
+
+exporters:
+  otlp:
+    endpoint: quickwit:7281
+    compression: none
+    tls:
+      insecure: true
+
+service:
+  pipelines:
+    logs:
+      receivers: [syslog]
+      processors: [batch]
+      exporters: [otlp]
+```
+
+## Start the OTEL collector and a Quickwit instance
+
+Let's use `docker compose` with the following configuration:
+
+The following boilerplate config includes a fragment that can be used to enable the syslog log-driver on docker-compose services.
+
+``` yaml title="docker-compose.yaml"
+version: '3.9'
+
+# Use this configuration fragment to use docker's syslog log driver
+x-syslog-logging: &logging
+  driver: "syslog"
+  options:
+    tag: "docker/{{.Name}}"
+    syslog-address: "tcp://127.0.0.1:54526"
+    syslog-format: "rfc5424"
+
+```
+
+This snippet makes sure container networking behaves correctly on linux for the collector to export to quickwit.
+
+``` yaml
+networks:
+  logging:
+    name: logging
+    ipam:
+      driver: default
+      config:
+      - subnet: "192.168.32.0/20"
+```
+
+And here you have both the collector and quickwit services. Notice the use of the logging fragment and logging network on both containers.
+
+``` yaml
+services:
+  otelcollector:
+    container_name: otelcollector
+    image: otel/opentelemetry-collector-contrib:${OTEL_VERSION:-0.87.0}
+    ports:
+      - 54526:54526/tcp  # Open this TCP port for the docker daemon to send logs to the collector
+    volumes:
+      - ./otel-collector-config.yaml:/etc/otel-collector/config.yaml
+    command: ["--config=/etc/otel-collector/config.yaml"] 
+    logging: *logging
+    networks:
+      logging:
+
+  quickwit:
+    container_name: quickwit
+    image: 
+    ports:
+      - 7280:7280
+      - 7281:7281
+    volumes:
+      - ./volumes/qwdata:/quickwit/qwdata
+    environment:
+      QW_ENABLE_OPENTELEMETRY_OTLP_EXPORTER: "true"
+      OTEL_EXPORTER_OTLP_ENDPOINT: "http://localhost:7281"
+    command: ["run"]
+    logging: *logging
+    networks:
+      logging:
+```
+
+For good measure, let's add Grafana+quickwit-datasource to the mix.
+
+``` yaml
+  grafana:
+    container_name: grafana
+    image: grafana/grafana-oss
+    ports:
+      - "3000:3000"
+    environment:
+      GF_INSTALL_PLUGINS: https://github.com/quickwit-oss/quickwit-datasource/releases/download/v0.3.0/quickwit-quickwit-datasource-0.3.0.zip;quickwit-quickwit-datasource
+      GF_AUTH_DISABLE_LOGIN_FORM: "true"
+      GF_AUTH_ANONYMOUS_ENABLED: "true"
+      GF_AUTH_ANONYMOUS_ORG_ROLE: Admin
+    volumes:
+      - ./volumes/grafana:/var/lib/grafana
+    logging: *logging
+    networks:
+      logging:
+```
+
+## Run it and search
+
+Download the configuration files and start the containers:
+
+```bash
+
+mkdir -p volumes/qwdata volumes/grafana
+docker compose up
+```
+
+After a few seconds, you will see the logs in the Quickwit UI [http://localhost:7280](http://localhost:7280).