Here's a quick summary of what we will be doing in this guide

• Create and configure Cloud Run
• Create Pub/Sub topic
• Create Log Router to route the Cloud Run service logs to SigNoz
• Create Compute Engine instance
• Create OTel Collector to route logs from Pub/Sub topic to SigNoz Cloud
• Send and Visualize the logs in SigNoz Cloud

Prerequisites

• Google Cloud account with administrative privilege or Cloud Run Admin, Artifact Registry Admin, Compute Engine Admin, Pub/Sub Admin and Logging Admin privileges.
• SigNoz Cloud Account (we are using SigNoz Cloud for this demonstration, we will also need ingestion details. To get your Ingestion Key and Ingestion URL, sign-in to your SigNoz Cloud Account and go to Settings >> Ingestion Settings)
• Access to a project in GCP

Setup

Get started with Cloud Run service setup

Follow the steps mentioned in the Cloud Run Service Setup page to create Cloud Run Service.

Create Pub/Sub Topic

Follow the steps mentioned in the Creating Pub/Sub Topic document to create the Pub/Sub topic.

Create Log Router to Pub/Sub Topic

Follow the steps mentioned in the Log Router Setup document to create the Log Router.

To ensure you filter out only the Cloud Run logs, use the following filter conditions:

resource.type="cloud_run_revision"
resource.labels.service_name="<cloud-run-service-name>"

Setup OTel Collector

Follow the steps mentioned in the Creating Compute Engine document to create the Compute Engine instance.

Install OTel Collector as agent

Firstly, we will establish the authentication using the following commands:

1. Initialize gcloud:

gcloud init

2. Authenticate into GCP:

gcloud auth application-default login

Let us now proceed to the OTel Collector installation:

Step 1: Download otel-collector tar.gz for your architecture

wget https://github.com/open-telemetry/opentelemetry-collector-releases/releases/download/v0.88.0/otelcol-contrib_0.88.0_linux_amd64.tar.gz

Step 2: Extract otel-collector tar.gz to the otelcol-contrib folder

mkdir otelcol-contrib && tar xvzf otelcol-contrib_0.88.0_linux_amd64.tar.gz -C otelcol-contrib

Step 3: Create config.yaml in the folder otelcol-contrib with the below content in it. Replace <region> with the appropriate SigNoz Cloud region. Replace SIGNOZ_INGESTION_KEY with what is provided by SigNoz:

receivers:
  otlp:
    protocols:
      grpc:
        endpoint: 0.0.0.0:4317
      http:
        endpoint: 0.0.0.0:4318
  googlecloudpubsub:
    project: <gcp-project-id>
    subscription: projects/<gcp-project-id>/subscriptions/<pubsub-topic's-subscription>
    encoding: raw_text
processors:
  batch: {}
exporters:
  otlp:
    endpoint: "ingest.<region>.signoz.cloud:443"
    tls:
      insecure: false
    headers:
      "signoz-ingestion-key": "<SigNoz-Key>"
service:
  pipelines:
    traces:
      receivers: [otlp]
      processors: [batch]
      exporters: [otlp]
    metrics:
      receivers: [otlp]
      processors: [batch]
      exporters: [otlp]
    logs:
      receivers: [otlp, googlecloudpubsub]
      processors: [batch]
      exporters: [otlp]

Step 4: Once we are done with the above configurations, we can now run the collector service with the following command:

From the otelcol-contrib, run the following command:

./otelcol-contrib --config ./config.yaml

Run in background

If you want to run OTel Collector process in the background:

./otelcol-contrib --config ./config.yaml &> otelcol-output.log & echo "$!" > otel-pid

The above command sends the output of the otel-collector to otelcol-output.log file and prints the process id of the background running OTel Collector process to the otel-pid file.

If you want to see the output of the logs you’ve just set up for the background process, you may look it up with:

tail -f -n 50 otelcol-output.log

You can now trigger the Cloud Run service URL a few times, and see the logs from the Cloud Run service on SigNoz Cloud.