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Target Allocator

The TargetAllocator is an optional separately deployed component of an OpenTelemetry Collector setup, which is used to distribute targets of the PrometheusReceiver on all deployed Collector instances.

Design

If the Allocator is activated, all Prometheus configurations will be transferred in a separate ConfigMap which get in turn mounted to the Allocator.
This configuration will be resolved to target configurations and then split across all OpenTelemetryCollector instances.

TargetAllocators exposes the results as HTTP_SD endpoints split by collector.

Watchers

Watchers are responsible for the translation of external sources into Prometheus readable scrape configurations and triggers updates to the DiscoveryManager

DiscoveryManager

Watches the Prometheus service discovery for new targets and sets targets to the Allocator

Allocator

Shards the received targets based on the discovered Collector instances

Collector

Client to watch for deployed Collector instances which will then provided to the Allocator.

Endpoints

/jobs:

{
  "job1": {
    "_link": "/jobs/job1/targets"
  },
  "job2": {
    "_link": "/jobs/job1/targets"
  }
}

/jobs/{jobID}/targets:

{
  "collector-1": {
    "_link": "/jobs/job1/targets?collector_id=collector-1",
    "targets": [
      {
        "Targets": [
          "10.100.100.100",
          "10.100.100.101",
          "10.100.100.102"
        ],
        "Labels": {
          "namespace": "a_namespace",
          "pod": "a_pod"
        }
      }
    ]
  }
}

/jobs/{jobID}/targets?collector_id={collectorID}:

[
  {
    "targets": [
      "10.100.100.100",
      "10.100.100.101",
      "10.100.100.102"
    ],
    "labels": {
      "namespace": "a_namespace",
      "pod": "a_pod"
    }
  }
]