feat: collect all pods logs

[hranicka]

This is an addition to #50

It adds a configuration which would allow OTEL to receive logs from all pods.

I use it this way as a one-for-everything solution for metrics, tracing and log management in my clusters.

I am not sure if this should be enabled by default. If not, some if-switches/configuration can be added. What would be your opinion to this?

[hranicka]

Hmm, now I see.

I would say this is not a preferable option to collect logs.

Instead, Vector or something else should be used, right?

https://uptrace.dev/ingest/logs/vector

If anybody searches for a solution, this might be helm values for Vector reporting logs from all pods to the Uptrace:

role: Agent

service:
  enabled: false

customConfig:
  data_dir: /vector-data-dir

  sources:
    kubernetes_logs:
      type: kubernetes_logs

  transforms:
    enrich_metadata:
      type: remap
      inputs: ["kubernetes_logs"]
      source: |
        .namespace = .kubernetes.pod_namespace
        .container = .kubernetes.container_name
        .pod = .kubernetes.pod_name
        .node = .kubernetes.pod_node_name
        .owner = .kubernetes.pod_owner
        .image = .kubernetes.container_image

  sinks:
    uptrace:
      type: http
      method: post
      inputs: ["enrich_metadata"]
      uri: "http://my-uptrace.uptrace.svc.cluster.local:14318/api/v1/vector/logs"
      encoding:
        codec: json
      framing:
        method: newline_delimited
      compression: gzip
      request:
        headers:
          uptrace-dsn: "http://project2_secret_token@localhost:14318?grpc=14317"

[vmihailenco]

Instead, Vector or something else should be used, right?

When possible, we probably should prefer using otelcol as long as it works.

If anybody searches for a solution, this might be helm values for Vector reporting logs from all pods to the Uptrace:

I guess this uses the official helm chart? I like that someone else will be maintaining it... going to check if there is a similar solution for otelcol...

[vmihailenco]

@hranicka could you please check if I correctly ported you changes in #58 ?

[hranicka]

Despite many whitespace changes, LGTM. Thank you very much :-)
Have not tested yet, though.