503 error returned from Cloud Run running "gcr.io/endpoints-release/endpoints-runtime-serverless:2.23" as base image

This [issue](https://github.com/GoogleCloudPlatform/esp-v2/issues/430) has re-occurred in our prod environment.

Architecture is configured to connect cloud run and cloud functions using Cloud Endpoint using the following [documentation](https://cloud.google.com/endpoints/docs/openapi/get-started-cloud-functions).

ESPv2 image is running on Cloud run. Base image used by cloud run is ` gcr.io/endpoints-release/endpoints-runtime-serverless:2.23` which gets build using the following [script](https://github.com/GoogleCloudPlatform/esp-v2/blob/40caa16ea9b4231ab9272bce2c9dfcec95dee3e5/docker/serverless/gcloud_build_image)

Cloud run is running with following configuration:

CPU allocated: 2
Memory allocated: 2048
Concurrency: 80
Request timeout: 800 seconds
Auto-scaling: Min instances: 5
Auto-scaling: Max instances: 1,000

Frequency: We have received few errors yesterday and more few weeks ago (when base image used was `gcr.io/endpoints-release/endpoints-runtime-serverless:2.22`)

No significant logging can be seen on cloud trace as well. Attaching screenshot

Logs from the Cloud Run running ESPv2

It will be really helpful if you can provide with some information/explanation of this issue resurfacing.
Thankyou!