Ecs observer - Add Relabel Config to Prometheus Receiver Translator (#1828)

Add Relabel Config to the Prometheus Receiver Translator when ECS Observer is enabled. The purpose of this change is to modify the Prometheus File-based service discovery labels collected by OTel ECS Observer to maintain parity with the existing EcsServicediscovery telegraf plugin

Authored-by: Akansha Agarwal <agarakan@users.noreply.github.com>

Author: agarakan

translator/tocwconfig/sampleConfig/prometheus_ecs_sd_config_linux.conf

@@ -0,0 +1,27 @@
+[agent]
+  collection_jitter = "0s"
+  debug = false
+  flush_interval = "1s"
+  flush_jitter = "0s"
+  hostname = ""
+  interval = "60s"
+  logfile = "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log"
+  logtarget = "lumberjack"
+  metric_batch_size = 1000
+  metric_buffer_limit = 10000
+  omit_hostname = false
+  precision = ""
+  quiet = false
+  round_interval = false
+
+[outputs]
+
+  [[outputs.cloudwatch]]
+
+  [[outputs.cloudwatchlogs]]
+    endpoint_override = "https://fake_endpoint"
+    force_flush_interval = "30s"
+    log_stream_name = "i-UNKNOWN"
+    mode = "EC2"
+    region = "us-west-2"
+    region_type = "ACJ"

translator/tocwconfig/sampleConfig/prometheus_ecs_sd_config_linux.json

@@ -0,0 +1,102 @@
+{
+  "agent": {
+    "region": "us-west-2"
+  },
+  "metrics": {
+    "metrics_destinations": {
+      "cloudwatch": {},
+      "amp": {
+        "workspace_id": "ws-12345"
+      }
+    },
+    "metrics_collected": {
+      "prometheus": {
+        "prometheus_config_path": "{prometheusFileName}"
+      }
+    }
+  },
+  "logs": {
+    "metrics_collected": {
+      "prometheus": {
+        "cluster_name": "TestCluster",
+        "log_group_name": "/aws/ecs/containerinsights/TestCluster/prometheus",
+        "prometheus_config_path": "{prometheusFileName}",
+        "ecs_service_discovery": {
+          "docker_label": {
+            "sd_job_name_label": "ECS_PROMETHEUS_JOB_NAME_1",
+            "sd_metrics_path_label": "ECS_PROMETHEUS_METRICS_PATH",
+            "sd_port_label": "ECS_PROMETHEUS_EXPORTER_PORT_SUBSET"
+          },
+          "task_definition_list": [
+            {
+              "sd_job_name": "task_def_1",
+              "sd_metrics_path": "/stats/metrics",
+              "sd_metrics_ports": "9901",
+              "sd_task_definition_arn_pattern": ".*task_def_1:[0-9]+"
+            },
+            {
+              "sd_container_name_pattern": "^envoy$",
+              "sd_metrics_ports": "9902",
+              "sd_task_definition_arn_pattern": "task_def_2"
+            }
+          ],
+          "service_name_list_for_tasks": [
+            {
+              "sd_job_name": "service_name_1",
+              "sd_metrics_path": "/metrics",
+              "sd_metrics_ports": "9113",
+              "sd_service_name_pattern": ".*-application-stack",
+              "sd_container_name_pattern": "nginx-prometheus-exporter"
+            },
+            {
+              "sd_metrics_path":"/stats/metrics",
+              "sd_metrics_ports": "9114",
+              "sd_service_name_pattern": "run-application-stack"
+            }
+          ],
+          "sd_cluster_region": "us-west-2",
+          "sd_frequency": "1m",
+          "sd_result_file": "{ecsSdFileName}",
+          "sd_target_cluster": "ecs-cluster-a"
+        },
+        "emf_processor": {
+          "metric_declaration_dedup": true,
+          "metric_namespace": "CustomizedNamespace",
+          "metric_unit": {
+            "nginx_request_count": "Count"
+          },
+          "metric_declaration": [
+            {
+              "dimensions": [["Service"]],
+              "label_matcher": "nginx.*",
+              "label_separator": ";",
+              "metric_selectors": ["^nginx_request_count$"],
+              "source_labels": ["Service"]
+            },
+            {
+              "label_matcher": "default",
+              "metric_selectors": [".*"],
+              "source_labels": ["Namespace"]
+            },
+            {
+              "source_labels":["name"],
+              "dimensions":[
+                ["name"]
+              ],
+              "metric_selectors": ["^.*$"]
+            },
+            {
+              "source_labels":["name"],
+              "dimensions":[
+                ["name"]
+              ],
+              "metric_selectors": ["^node_cpu_guest_seconds_total$"]
+            }
+          ]
+        }
+      }
+    },
+    "force_flush_interval": 30,
+    "endpoint_override":"https://fake_endpoint"
+  }
+}