Add Tempo Nomad job example in Monolithic Mode (#4495)

* Add tempo nomad monolith example

* Update README.md

example/nomad/tempo-monolith/README.md

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+# Monolithic mode
+
+This Nomad job will deploy Tempo in
+[monolithic mode](https://grafana.com/docs/tempo/latest/setup/deployment/#monolithic-mode) using S3 backend.
+
+## Usage
+
+### Prerequisites
+- S3 compatible storage
+
+Variables
+--------------
+
+| Name | Value | Description |
+|---|---|---|
+| version | Default = "2.3.1" | Tempo version |
+| s3_url | Default = "s3.dummy.url.com" | S3 storage URL |
+| s3_access_key_id | Default = "any" | S3 Access Key ID |
+| s3_secret_access_key | Default = "any" | S3 Secret Access Key |
+| prometheus_remote_write_url | Default = "http://prometheus.service.consul/api/v1/write" | Prometheus Remote Write URL |
+
+### Run job
+
+Inside directory with job run:
+
+```shell
+nomad job run tempo.hcl
+```
+
+To deploy a different version change `variable.version` default value or
+specify from command line:
+
+```shell
+nomad job run -var="version=2.6.1" tempo.hcl
+```

example/nomad/tempo-monolith/tempo.hcl

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+variable "version" {
+  type        = string
+  description = "Tempo version"
+  default     = "2.3.1"
+}
+
+variable "prometheus_remote_write_url" {
+  type        = string
+  description = "Prometheus Remote Write URL"
+  default     = "http://prometheus.service.consul/api/v1/write"
+}
+
+variable "s3_url" {
+  type        = string
+  description = "S3 URL"
+  default     = "s3.dummy.url"
+}
+
+variable "s3_access_key_id" {
+  type        = string
+  description = "S3 Access Key ID"
+  default     = "any"
+}
+
+variable "s3_secret_access_key" {
+  type        = string
+  description = "S3 Secret Access Key"
+  default     = "any"
+}
+
+job "tempo" {
+  datacenters = ["*"]
+
+  group "tempo" {
+    count = 1
+
+    network {
+      port "http" {
+        to = 3200
+      }
+      port "grpc" {}
+    }
+
+    service {
+      name = "tempo-http"
+      port = "http"
+      tags = []
+      check {
+        name     = "tempo-http"
+        port     = "http"
+        type     = "http"
+        path     = "/ready"
+        interval = "20s"
+        timeout  = "1s"
+      }
+    }
+
+    service {
+      name = "tempo-grpc"
+      port = "grpc"
+      tags = []
+      check {
+        port     = "grpc"
+        type     = "grpc"
+        interval = "20s"
+        timeout  = "1s"
+        grpc_use_tls = false
+        tls_skip_verify = true
+      }
+    }
+
+    task "tempo" {
+      driver       = "docker"
+      user         = "nobody"
+      kill_timeout = "90s"
+
+      config {
+        image = "grafana/tempo:${var.version}"
+        ports = [
+          "http",
+          "grpc",
+        ]
+
+        args = [
+          "-target=all",
+          "-config.file=/local/config.yml",
+          "-config.expand-env=true",
+        ]
+      }
+      template {
+        data        = <<-EOC
+        server:
+          log_level: info
+          http_listen_port: {{ env "NOMAD_PORT_http" }}
+          grpc_listen_port: {{ env "NOMAD_PORT_grpc" }}
+
+        distributor:
+          receivers:                           # this configuration will listen on all ports and protocols that tempo is capable of.
+            otlp:
+              protocols:
+                http:
+                grpc:
+
+        metrics_generator:
+          processor:
+            service_graphs:
+              max_items: 10000
+
+          storage:
+            path: {{ env "NOMAD_ALLOC_DIR" }}/tempo/wal
+            remote_write:
+              - url: ${var.prometheus_remote_write_url}
+                send_exemplars: true
+
+        storage:
+          trace:
+            backend: s3
+            wal:
+              path: {{ env "NOMAD_ALLOC_DIR" }}/tempo/wal
+            local:
+              path: {{ env "NOMAD_ALLOC_DIR" }}/tempo/blocks
+            s3:
+              bucket: tempo                    # how to store data in s3
+              endpoint: ${var.s3_url}
+              insecure: true
+              access_key: ${var.s3_access_key_id}
+              secret_key: ${var.s3_secret_access_key}
+
+        overrides:
+          defaults:
+            metrics_generator:
+              processors:
+                - service-graphs
+                - span-metrics
+        EOC
+        destination = "local/config.yml"
+      }
+
+
+      resources {
+        cpu        = 300
+        memory     = 1024
+      }
+    }
+  }
+}