Improve logs of central-application-gateway

[Disper]

Description

@ebensom pointed out that logs in central-application-gateway should be improved.

Acceptance criteria:

• Distinguish return codes returned from the target API and those returned by Application Gateway (is this 5xx mine or not)
• Consider adding possibility to define multiple log levels.
• Consider using tools for logging in a structured way (kyma/common)
• Consider ability to change log level without component restart (there is a solution in function controller)
• Consider using tracing to observe how the request is modified

Reasons

Better logs will make it easier to find issues faster.

[kyma-bot]

This issue or PR has been automatically marked as stale due to the lack of recent activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Mark this issue or PR as fresh with /remove-lifecycle stale
• Close this issue or PR with /close

If you think that I work incorrectly, kindly raise an issue with the problem.

/lifecycle stale

[kyma-bot]

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

[kyma-bot]

@kyma-bot: Closing this issue.

In response to this:

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[kyma-bot]

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

[kyma-bot]

@kyma-bot: Closing this issue.

In response to this:

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[kyma-bot]

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

[kyma-bot]

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

[kyma-bot]

@kyma-bot: Closing this issue.

In response to this:

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Reopen this issue or PR with /reopen
• Mark this issue or PR as fresh with /remove-lifecycle stale

If you think that I work incorrectly, kindly raise an issue with the problem.

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[Disper]

Adding a suggestion received from @ebensom on an internal tool that we can't cross-link here:

the "proxy" logs to proper access logs, which at least contain
- request URL (scheme, host, port, path)
- response code
- response size
- response duration in ms (optional)

[akgalwas]

In the first step we must ensure that:

• it is possible to distinguish whether the error code was returned by the target API or the Application Gateway (please ind this comment)
• for 5xx errors Application Gateway should return 502 so that SLA calculation for Application Gateway doesn't include errors returned by the target API