Open Telemetry Issue in GCP App Engine

[BobLiu2046]

Please answer these questions before submitting a bug report.

What version of OpenTelemetry are you using?

"@google-cloud/opentelemetry-cloud-trace-exporter": "^0.3.0",
"@opentelemetry/core": "^0.9.0",
"@opentelemetry/node": "^0.9.0",
"@opentelemetry/plugin-http": "^0.9.0",
"@opentelemetry/plugin-https": "^0.9.0",
"@opentelemetry/tracing": "^0.9.0",

What version of Node are you using?

10

What did you do?

We want to implement the open telemetry for our backend API which is hosted in GCP App Engine

We deployed the code [1] to our GCP dev and staging environments. It’s working fine, we can see the data in Cloud Trace Waterfall View, but it's not working in our perf environment. in perf environment we got the error messages below

could not load plugin @opentelemetry/plugin-express
could not load plugin @opentelemetry/plugin-grpc

Actually in our case, we don't need express and grpc plugins. However to fix this issue, we install those 2 plugins, the plugin missing issue is disappeared after the installation, but we got another error "You can only call end() on a span once"

From this link [2] the plugin missing is an open bug and we need to disable plugin-express and plugin-grpc [3] as a workaround. We make the same change and disable those 2 plugins, now the plugin missing issue is disappeared , but we still cannot see the data in Cloud Trace Waterfall View.

[1]
const { TraceExporter } = require('@google-cloud/opentelemetry-cloud-trace-exporter');
const { LogLevel } = require("@opentelemetry/core");
const { SimpleSpanProcessor, BatchSpanProcessor } = require("@opentelemetry/tracing");
const { NodeTracerProvider } = require("@opentelemetry/node");

// Create and configure NodeTracerProvider
const provider = new NodeTracerProvider({
logLevel: LogLevel.ERROR
});

// Initialize the provider
provider.register();

// Create an exporter for sending spans data
const exporter = new TraceExporter({
// If you are not in a GCP environment, you will need to provide your
// service account key here. See the Authentication section below.
});

// Configure a span processor for the tracer
provider.addSpanProcessor(new BatchSpanProcessor(exporter));

console.log("tracing initialized");

[2] #1124

[3]
const { TraceExporter } = require('@google-cloud/opentelemetry-cloud-trace-exporter');
const { LogLevel } = require("@opentelemetry/core");
const { SimpleSpanProcessor, BatchSpanProcessor } = require("@opentelemetry/tracing");
const { NodeTracerProvider } = require("@opentelemetry/node");

// Create and configure NodeTracerProvider
const provider = new NodeTracerProvider({
logLevel: LogLevel.ERROR,
plugins: {
express: {
enabled: false,
path: '@opentelemetry/plugin-express',
},
grpc: {
enabled: false,
path: '@opentelemetry/plugin-grpc',
},
}
});

// Initialize the provider
provider.register();

// Create an exporter for sending spans data
const exporter = new TraceExporter({
// If you are not in a GCP environment, you will need to provide your
// service account key here. See the Authentication section below.
});

// Configure a span processor for the tracer
provider.addSpanProcessor(new BatchSpanProcessor(exporter));

console.log("tracing initialized");

[vmarchaud]

could not load plugin @opentelemetry/plugin-express
could not load plugin @opentelemetry/plugin-grpc

Those are actually warnings because you didn't install the plugins, you can ignore this.

You can only call end() on a span once

This problem is about the express plugin, an issue is ongoing here

About the general export issue you reported, i think the problem might comes from the stackdriver exporter itself, you could give a ConsoleLogger to the stackdriver exporter and set its verbosity to DEBUG to get more insight.

[vmarchaud]

I'll go ahead and close this since i don't believe the problem comes from the the sdk itself, feel free to reopen if you believe its not the case.