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Yingjie's Memoir

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2026-05-28 ​

Morning Plan ​

  • [ ] MoonBit Competition
    • [x] Compare MoonBit's OTel library with the official OTel implementation to see current progress
      • [x] Reasonix (DeepSeek V4 Flash MAX) says it already has the basic capability to build an industrial-grade observability SDK
    • [ ] Think about which instrumentation libraries MoonBit needs most
      • [ ] Agent observability?
    • [ ] Ask the maintainer responsible for observability at MoonBit which libraries they urgently need
  • [ ] Ask senior professionals in the observability field for good ways to get involved in the domain

Data Rescue ​

This morning, my computer threw an error during startup.

S.M.A.R.T Test Warning
... S.M.A.R.T Status is Bad. Place Backuop and Replace the device.

First, rescue the data: removed the hard drive, put it into an external enclosure, and copied out the important data.

Later, I tested it with a hard drive diagnostic tool, which reported serious issues.

This hard drive is a Kingston KC2500, bought in 2021—almost 5 years old. Many of my hard drives at home are around the same age, which reminded me that the lifespan of other drives might be nearing its end. I need to back up data ASAP.

While copying data, I ran into permission issues and fixed them using the takedown command. If there are too many files, the permission change takes a long time, so I only changed it for important data storage locations.

Loong: Enabling HTTPS for Loong Observability & OTel Collector ​

  1. Updated documentation, scripts, and configuration files
  2. Added custom client to support specifying a root CA

Adding HTTPS was simpler than I expected. Under deploy/observability:

  • generate-certs.sh: script to generate the root CA key pair and server key pair
  • certs/: stores the CA key pair and server key pair
  • docker-compose.yml: mounts for the OTel Collector
yaml
services:
  otel-collector:
    image: otel/opentelemetry-collector-contrib:latest
    volumes:
      - ./otel-collector-config.yaml:/etc/otel-collector-config.yaml
      # TLS certs (generated by generate-certs.sh)
      - ./certs/server.crt:/etc/certs/server.crt
      - ./certs/server.key:/etc/certs/server.key
  • otel-collector.yml: specifies the key pair files for the OTel Collector
yaml
receivers:
  otlp:
    protocols:
      http:
        endpoint: 0.0.0.0:4318
        tls:
          cert_file: /etc/certs/server.crt
          key_file: /etc/certs/server.key
      grpc:
        endpoint: 0.0.0.0:4317

Before starting Loong, run the command export OTEL_CA_CERT_FILE=$(pwd)/certs/ca.pem in this directory to import the CA root certificate into the custom client.