signoz/pkg/query-service/app/integrations/builtin_integrations/postgres/config/collect-logs.md

Collect Postgres Logs

You can configure Postgres logs collection by providing the required collector config to your collector.

Create collector config file

Save the following config for collecting postgres logs in a file named postgres-logs-collection-config.yaml

receivers:
  filelog/postgresql:
    include: ["${env:POSTGRESQL_LOG_FILE}"]
    operators:
      # Parse default postgresql text log format.
      # `log_line_prefix` postgres setting defaults to '%m [%p] ' which logs the timestamp and the process ID
      # See https://www.postgresql.org/docs/current/runtime-config-logging.html#GUC-LOG-LINE-PREFIX for more details
      - type: regex_parser
        if: body matches '^(?P<ts>\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}.?[0-9]*? [A-Z]*) \\[(?P<pid>[0-9]+)\\] (?P<log_level>[A-Z]*). (?P<message>.*)$'
        parse_from: body
        regex: '^(?P<ts>\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}.?[0-9]*? [A-Z]*) \[(?P<pid>[0-9]+)\] (?P<log_level>[A-Z]*). (?P<message>.*)$'
        timestamp:
          parse_from: attributes.ts
          layout: '%Y-%m-%d %H:%M:%S %Z'
        severity:
          parse_from: attributes.log_level
          mapping:
            debug:
              - DEBUG1
              - DEBUG2
              - DEBUG3
              - DEBUG4
              - DEBUG5
            info:
              - INFO
              - LOG
              - NOTICE
              - DETAIL
            warn: WARNING
            error: ERROR
            fatal:
              - FATAL
              - PANIC
        on_error: send
      - type: move
        if: attributes.message != nil
        from: attributes.message
        to: body
      - type: remove
        if: attributes.log_level != nil
        field: attributes.log_level
      - type: remove
        if: attributes.ts != nil
        field: attributes.ts
      - type: add
        field: attributes.source
        value: postgres

processors:
  batch:
    send_batch_size: 10000
    send_batch_max_size: 11000
    timeout: 10s

exporters:
  # export to SigNoz cloud
  otlp/postgres-logs:
    endpoint: "${env:OTLP_DESTINATION_ENDPOINT}"
    tls:
      insecure: false
    headers:
      "signoz-access-token": "${env:SIGNOZ_INGESTION_KEY}"

  # export to local collector
  # otlp/postgres-logs:
  #   endpoint: "localhost:4317"
  #   tls:
  #     insecure: true

service:
  pipelines:
    logs/postgresql:
      receivers: [filelog/postgresql]
      processors: [batch]
      exporters: [otlp/postgresql-logs]

Set Environment Variables

Set the following environment variables in your otel-collector environment:

# path of Postgres server log file. must be accessible by the otel collector
# typically found in /usr/local/var/log/postgresql on macOS
# running `SELECT pg_current_logfile();` can also give you the location of postgresql log file
export POSTGRESQL_LOG_FILE=/var/log/postgresql/postgresql.log

# region specific SigNoz cloud ingestion endpoint
export OTLP_DESTINATION_ENDPOINT="ingest.us.signoz.cloud:443"

# your SigNoz ingestion key
export SIGNOZ_INGESTION_KEY="signoz-ingestion-key"

Use collector config file

Make the collector config file available to your otel collector and use it by adding the following flag to the command for running your collector

--config postgres-logs-collection-config.yaml

Note: the collector can use multiple config files, specified by multiple occurrences of the --config flag.