Enhance GRPC Monitoring

[thatInfrastructureGuy]

Goals:

• Checks GRPC services without TLS certs
• Checks GRPC services with TLS certs
• Asserts against GRPC Health check for advance checks.
• GRPC Health check is kept optional.
• Comments and Hyperlinks added for GRPC health check toggle.
• Updated default values for grpc check.
• Add Tests go test -v -run TestCheckGrpc ./...
• Bug Fix: Add timeout to Grpc.DialContext()

Docker Image for testing:

docker run -it -p 8080:8080 thatinfrastructureguy/statping:latest

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Note: If you are not sure if you have implemented GRPC health check endpoint, test it with grpcurl

grpcurl grpc.domain.com:50051 grpc.health.v1.Health/Check

{
  "status": "SERVING"
}

Required Fields:

1. Application URL domain.
2. Port Number
3. Verify SSL (Turn this flag on if you are serving via TLS).

---

[thatInfrastructureGuy]

Slack notifications did not work for me on latest dev branch but did work on v0.90.64 hence, the image thatinfrastructureguy/statping:latest is built from v0.90.64

[thatInfrastructureGuy]

@hunterlong Please let me know if you need me to do any changes. I am aiming to get feedback before major set of merge conflicts arise. Just trying to avoid same fate as #405 :)

[hunterlong]

Merged, thanks @thatInfrastructureGuy I really appreciate it.