Interceptor

In the src/common/interceptors/newrelic.interceptor.ts file is the configuration that New Relic recommends for NestJS:

import {
  Injectable,
  NestInterceptor,
  ExecutionContext,
  CallHandler,
} from '@nestjs/common';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';
// eslint-disable-next-line @typescript-eslint/no-var-requires
const newrelic = require('newrelic');

@Injectable()
export class NewrelicInterceptor implements NestInterceptor {
  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    return newrelic.startWebTransaction(context.getHandler().name, function () {
      const transaction = newrelic.getTransaction();
      return next.handle().pipe(
        tap(() => {
          return transaction.end();
        }),
      );
    });
  }
}

The New Relic interceptor is invoked in the src/main.ts file, and is controlled via the NEW_RELIC_ENABLED environment variable, if you wish to use it.