Skip Timestamp For Agent Log

[sethAmazon]

Description of the issue

The customer noticed the issue because we now log the toml output on start of agent. This includes a line with the date format that is old.
We keep logging the same entry for a bad time stamp config when recording agent logs.

    {
      "agent": {
        "logfile": "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log"
      },
      "logs": {
        "logs_collected": {
          "files": {
            "collect_list": [
          {
                "file_path": "/var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
                "log_group_name": "stage-InstanceLogGroup",
                "log_stream_name": "(v124-1) - /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
                "timestamp_format": "%Y-%m-%d%H:%M:%S"
              }
            ]
          }
        },
        "force_flush_interval" : 15
      }
    }

If we have a valid timestamp in the log we will not keep logging the same log line.

    {
      "agent": {
        "logfile": "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log"
      },
      "logs": {
        "logs_collected": {
          "files": {
            "collect_list": [
          {
                "file_path": "/var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
                "log_group_name": "stage-InstanceLogGroup",
                "log_stream_name": "(v124-1) - /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
                "timestamp_format": "%Y-%m-%dT%H:%M:%S"
              }
            ]
          }
        },
        "force_flush_interval" : 15
      }
    }

Description of changes

Do not use timestamp when reading agent log file.

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

Manual testing to see no log for invalid timestamp in logs with config

log out if time stamp is skipped in translation layer

timestamp_format set timesfile_path : /opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log is the same as agent log file /opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log thus do not use timestamp_regex
timestamp_format set file_path : /opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log is the same as agent log file /opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log thus do not use timestamp_layout

{
  "agent": {
    "logfile": "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log"
  },
  "logs": {
    "logs_collected": {
      "files": {
        "collect_list": [
      {
            "file_path": "/var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
            "log_group_name": "stage-InstanceLogGroup",
            "log_stream_name": "(v124-1) - /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
            "timestamp_format": "%Y-%m-%dT%H:%M:%S"
          }
        ]
      }
    },
    "force_flush_interval" : 15
  }
}

# Requirements
_Before commit the code, please do the following steps._
1. Run `make fmt` and `make fmt-sh`
2. Run `make lint`

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.64%. Comparing base (96d4763) to head (613b7c6).
⚠️ Report is 995 commits behind head on main.

Files with missing lines	Patch %	Lines
...ollected/files/collect_list/ruleTimestampFormat.go	25.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #885      +/-   ##
==========================================
+ Coverage   57.58%   62.64%   +5.05%     
==========================================
  Files         370      338      -32     
  Lines       17548    17016     -532     
==========================================
+ Hits        10105    10659     +554     
+ Misses       6848     5800    -1048     
+ Partials      595      557      -38     

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[okankoAMZ]

You should update the branch with main, but except for that looks good to me!

[ymtaye]

LGTM! I had PR which will modify the timestamp_layout and timestamp_regex. I can make the changes in my PR if this gets merged first but aside from that all good

[okankoAMZ]

You should update the branch with main, but except for that looks good to me!