Add Nomad examples on "Getting Started"

examples/nomad/otel-agent.nomad

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+job "otel-agent" {
+  datacenters = ["dc1"]
+  type        = "system"
+
+  group "otel-agent" {
+    network {
+      port "metrics" {
+        to = 8888
+      }
+
+      # Receivers
+      port "otlp" {
+        to = 4317
+      }
+
+      # Extensions
+      port "health-check" {
+        to = 13133
+      }
+
+      port "zpages" {
+        to = 55679
+      }
+    }
+
+    service {
+      name = "otel-agent"
+      port = "health-check"
+      tags = ["health"]
+
+      check {
+        type     = "http"
+        port     = "health-check"
+        path     = "/"
+        interval = "5s"
+        timeout  = "2s"
+      }
+    }
+
+    service {
+      name = "otel-agent"
+      port = "otlp"
+      tags = ["otlp"]
+    }
+
+    service {
+      name = "otel-agent"
+      port = "metrics"
+      tags = ["metrics"]
+    }
+
+    service {
+      name = "otel-agent"
+      port = "zpages"
+      tags = ["zpages"]
+    }
+
+    task "otel-agent" {
+      driver = "docker"
+
+      config {
+        image = "otel/opentelemetry-collector-dev:latest"
+
+        entrypoint = [
+          "/otelcol",
+          "--config=local/config/otel-agent-config.yaml",
+          # Memory Ballast size should be max 1/3 to 1/2 of memory.
+          "--mem-ballast-size-mib=165"
+        ]
+
+        ports = [
+          "metrics",
+          "otlp",
+          "health-check",
+          "zpages",
+        ]
+      }
+
+      resources {
+        cpu    = 500
+        memory = 500
+      }
+
+      template {
+        data        = <<EOF
+receivers:
+  otlp:
+    protocols:
+      grpc:
+      http:
+exporters:
+  otlp:
+    endpoint: "{{ with service "otel-collector" }}{{ with index . 0 }}{{ .Address }}:{{ .Port }}{{ end }}{{ end }}"
+    insecure: true
+    sending_queue:
+      num_consumers: 4
+      queue_size: 100
+    retry_on_failure:
+      enabled: true
+processors:
+  batch:
+  memory_limiter:
+    # Same as --mem-ballast-size-mib CLI argument
+    ballast_size_mib: 165
+    # 80% of maximum memory up to 2G
+    limit_mib: 400
+    # 25% of limit up to 2G
+    spike_limit_mib: 100
+    check_interval: 5s
+extensions:
+  health_check: {}
+  zpages: {}
+service:
+  extensions: [health_check, zpages]
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [memory_limiter, batch]
+      exporters: [otlp]
+EOF
+        destination = "local/config/otel-agent-config.yaml"
+      }
+    }
+  }
+}

examples/nomad/otel-collector.nomad

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+job "otel-collector" {
+  datacenters = ["dc1"]
+  type        = "service"
+
+  group "otel-collector" {
+    count = 1
+
+    network {
+      port "metrics" {
+        to = 8888
+      }
+
+      # Receivers
+      port "otlp" {
+        to = 4317
+      }
+
+      port "jaeger-grpc" {
+        to = 14250
+      }
+
+      port "jaeger-thrift-http" {
+        to = 14268
+      }
+
+      port "zipkin" {
+        to = 9411
+      }
+
+      # Extensions
+      port "health-check" {
+        to = 13133
+      }
+
+      port "zpages" {
+        to = 55679
+      }
+    }
+
+    service {
+      name = "otel-collector"
+      port = "health-check"
+      tags = ["health"]
+
+      check {
+        type     = "http"
+        port     = "health-check"
+        path     = "/"
+        interval = "5s"
+        timeout  = "2s"
+      }
+    }
+
+    service {
+      name = "otel-collector"
+      port = "otlp"
+      tags = ["otlp"]
+    }
+
+    service {
+      name = "otel-collector"
+      port = "jaeger-grpc"
+      tags = ["jaeger-grpc"]
+    }
+
+    service {
+      name = "otel-collector"
+      port = "jaeger-thrift-http"
+      tags = ["jaeger-thrift-http"]
+    }
+
+    service {
+      name = "otel-collector"
+      port = "zipkin"
+      tags = ["zipkin"]
+    }
+
+    service {
+      name = "otel-agent"
+      port = "metrics"
+      tags = ["metrics"]
+    }
+
+    service {
+      name = "otel-agent"
+      port = "zpages"
+      tags = ["zpages"]
+    }
+
+    task "otel-collector" {
+      driver = "docker"
+
+      config {
+        image = "otel/opentelemetry-collector-dev:latest"
+
+        entrypoint = [
+          "/otelcol",
+          "--config=local/config/otel-collector-config.yaml",
+          # Memory Ballast size should be max 1/3 to 1/2 of memory.
+          "--mem-ballast-size-mib=683"
+        ]
+
+        ports = [
+          "metrics",
+          "otlp",
+          "jaeger-grpc",
+          "jaeger-thrift-http",
+          "zipkin",
+          "health-check",
+          "zpages",
+        ]
+      }
+
+      resources {
+        cpu    = 500
+        memory = 2048
+      }
+
+      template {
+        data        = <<EOF
+receivers:
+  otlp:
+    protocols:
+      grpc:
+      http:
+  jaeger:
+    protocols:
+      grpc:
+      thrift_http:
+  zipkin: {}
+processors:
+  batch:
+  memory_limiter:
+    # Same as --mem-ballast-size-mib CLI argument
+    ballast_size_mib: 683
+    # 80% of maximum memory up to 2G
+    limit_mib: 1500
+    # 25% of limit up to 2G
+    spike_limit_mib: 512
+    check_interval: 5s
+extensions:
+  health_check: {}
+  zpages: {}
+exporters:
+  zipkin:
+    endpoint: "http://somezipkin.target.com:9411/api/v2/spans" # Replace with a real endpoint.
+  jaeger:
+    endpoint: "somejaegergrpc.target.com:14250" # Replace with a real endpoint.
+    insecure: true
+service:
+  extensions: [health_check, zpages]
+  pipelines:
+    traces/1:
+      receivers: [otlp, zipkin]
+      processors: [memory_limiter, batch]
+      exporters: [zipkin]
+    traces/2:
+      receivers: [otlp, jaeger]
+      processors: [memory_limiter, batch]
+      exporters: [jaeger]
+EOF
+        destination = "local/config/otel-collector-config.yaml"
+      }
+    }
+  }
+}