feat(dbi): Add severity parsing and fix multiline/timestamp for PostgreSQL server logs

[JayPolanco]

Description of the issue

DBI (Database Insights) server-logs filelog receiver had three issues:

1. Multiline log entries were being fragmented into separate log records
2. Timestamp parsing was not working (timeUnixNano was 0)
3. Severity levels (LOG/ERROR/WARNING/etc.) were not being parsed

Additionally, there was a gosnowflake/dbus dependency leak from contrib.

Description of changes

• Added WithSeverityPattern option to filelog translator
• DBI translator now configures multiline, timestamp, and severity parsing for PostgreSQL stderr logs
• Updated contrib version to 84054ba42340 to fix gosnowflake/dbus leak

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

• Added TestTranslator_WithTimestampAndSeverity for filelog translator
• Added TestDbiTranslateServerLogs_FilelogConfig for DBI translator
• Updated golden YAML files
• Verified on EC2 instance - logs now include severityNumber, severityText, and attributes.severity

Leak fixed

Created a bash script that does:

  #!/bin/bash
  for i in {1..5}; do
      sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl -a stop
      sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl -a start
      count=$(ps aux | grep 'dbus-daemon.*session' | grep -v grep | wc -l)
      echo "After restart $i: $count orphaned dbus-daemon processes"
  done

  $ bash test.sh
  After restart 1: 0 orphaned dbus-daemon processes
  After restart 2: 0 orphaned dbus-daemon processes
  After restart 3: 0 orphaned dbus-daemon processes
  After restart 4: 0 orphaned dbus-daemon processes
  After restart 5: 0 orphaned dbus-daemon processes

  $ ps aux | grep 'dbus-daemon.*session'
  ec2-user 21349  0.0  0.0   6756  2176 pts/0    S+   23:03   0:00 grep --color=auto dbus-daemon.*session

Also manually ran:

sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl -a fetch-config -m ec2 -c file:config.json -s

CloudWatch Log Output

ERROR log:

{
    "timeUnixNano": 1784329491691000000,
    "severityNumber": 17,
    "severityText": "ERROR",
    "body": "2026-07-17 23:04:51.691 UTC testdb postgres [21991]ERROR:  relation \"nonexistent_table_12345\" does not exist at character 15",
    "attributes": {
        "timestamp": "2026-07-17 23:04:51.691 UTC",
        "severity": "ERROR"
    }
}

LOG (regular) log:

  {
      "timeUnixNano": 1784329520159000000,
      "severityNumber": 9,
      "severityText": "LOG",
      "body": "2026-07-17 23:05:20.159 UTC testdb postgres [22079]LOG:  duration: 200.869 ms  statement: SELECT pg_sleep(0.2);",
      "attributes": {
          "timestamp": "2026-07-17 23:05:20.159 UTC",
          "severity": "LOG"
      }
  }

Requirements

1. Run make fmt and make fmt-sh
2. Run make lint

[github-actions]

Binary Size Report

linux/amd64

Binary	PR	vs main (5d99671)	vs v1.300070.0
amazon-cloudwatch-agent	193.2 MB	${\color{green}▼}$ 40.1 MB (-17.2%)	${\color{green}▼}$ 38.1 MB (-16.5%)
amazon-cloudwatch-agent-config-wizard	2.0 MB	+0 B	${\color{red}▲}$ +86.0 KB (+4.5%)
config-downloader	2.0 MB	+0 B	${\color{red}▲}$ +86.0 KB (+4.5%)
config-translator	2.0 MB	+0 B	${\color{red}▲}$ +86.0 KB (+4.5%)
start-amazon-cloudwatch-agent	2.5 MB	+0 B	${\color{red}▲}$ +81.9 KB (+3.4%)
workload-discovery	3.0 MB	+0 B	${\color{red}▲}$ +86.0 KB (+2.9%)
Total	204.7 MB	${\color{green}▼}$ 40.1 MB (-16.4%)	${\color{green}▼}$ 37.7 MB (-15.6%)

linux/amd64 amazon-cloudwatch-agent (last 9 main commits + this PR)

 235 ┤                                        
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     ┤███ ███ ███ ███ ███ ███ ███ ███ ███     
 191 ┤███ ███ ███ ███ ███ ███ ███ ███ ███ ▄▄▄ 
 MB  └────────────────────────────────────────
      a53d263                             PR

Notable changes:

• +1.6 MB at 98e058f
• -40.1 MB at PR

linux/arm64

Binary	PR	vs main (5d99671)	vs v1.300070.0
amazon-cloudwatch-agent	176.9 MB	${\color{green}▼}$ 35.3 MB (-16.6%)	${\color{green}▼}$ 34.5 MB (-16.3%)
amazon-cloudwatch-agent-config-wizard	2.0 MB	+0 B	${\color{green}▼}$ 22 B (-0.0%)
config-downloader	2.0 MB	+0 B	${\color{green}▼}$ 22 B (-0.0%)
config-translator	2.0 MB	+0 B	${\color{green}▼}$ 22 B (-0.0%)
start-amazon-cloudwatch-agent	2.4 MB	+0 B	${\color{red}▲}$ +65.5 KB (+2.8%)
workload-discovery	2.9 MB	+0 B	${\color{red}▲}$ +65.5 KB (+2.3%)
Total	188.2 MB	${\color{green}▼}$ 35.3 MB (-15.8%)	${\color{green}▼}$ 34.4 MB (-15.5%)

windows/amd64

Binary	PR	vs main (5d99671)	vs v1.300070.0
amazon-cloudwatch-agent.exe	196.0 MB	${\color{green}▼}$ 40.3 MB (-17.0%)	${\color{green}▼}$ 38.2 MB (-16.3%)
amazon-cloudwatch-agent-config-wizard.exe	2.1 MB	+0 B	${\color{red}▲}$ +130.6 KB (+6.5%)
config-downloader.exe	2.1 MB	+0 B	${\color{red}▲}$ +130.0 KB (+6.5%)
config-translator.exe	2.1 MB	+0 B	${\color{red}▲}$ +130.6 KB (+6.5%)
start-amazon-cloudwatch-agent.exe	2.3 MB	+0 B	${\color{red}▲}$ +112.1 KB (+5.2%)
workload-discovery.exe	2.9 MB	+0 B	${\color{red}▲}$ +91.6 KB (+3.3%)
Total	207.6 MB	${\color{green}▼}$ 40.3 MB (-16.2%)	${\color{green}▼}$ 37.6 MB (-15.3%)

Investigating size changes

Use go-size-analyzer to compare binaries:

GOEXPERIMENT=jsonv2 go install github.com/Zxilly/go-size-analyzer/cmd/gsa@latest
gsa diff --old <baseline-binary> --new <new-binary>