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Metrics

The services of PLOSSYS Output Engine expose several custom metrics that provide insights into their operation and performance and can help to identify any potential issues. These metrics are exposed at the /metrics endpoint of each service and can be scraped by Prometheus. You can visualize them by using tools like Grafana to create dashboards that provide a real-time view of the system's performance.

Following is a brief overview of the custom metrics for each service. For in depth information, refer to Custom Metrics JSON below.

For more information about the overall health of your servers, refer to Default Metrics.

Custom Service Metrics

seal-bodyscanner

The seal-bodyscanner service scans the body of a print job and adds printer instructions to the postscript code. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

seal-checkin

The seal-checkin service is the entry point for LPR jobs. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

seal-checkout

The seal-checkout service is responsible for sending the print job to the printer. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

seal-co-notifier

The seal-co-notifier sends job status notifications to SAP and IPP backend systems. It exposes the following custom metrics additionally:

  • out_ngn_sap_notifications_total: This counter metric represents the total number of successfully sent SAP notifications. It has a label destination which indicates the destination of the notification.

seal-controller

The seal-controller service handles job and printer statuses and dispatches print jobs via streaming to follow-up services. It exposes the following custom metrics additionally:

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_jobs_per_state_total: This counter metric represents the total number of jobs per state. It has a label state which indicates the state of the job.

  • out_ngn_printer_locks: This gauge metric represents the number of printer locks per service.

  • out_ngn_printer_queue_length: This gauge metric represents the length of the printer queue. It has a label printername which indicates the name of the printer.

seal-convert-*

The seal-convert-* services (e.g. seal-convert-pdf2ps) are responsible for converting documents to the defined format. They expose the following metrics:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_parallel_processes: This gauge metric represents the number of currently parallel running converter processes.

  • out_ngn_requested_processes: This gauge metric represents the number of requested converter processes.

seal-convert-dispatcher

The seal-convert-dispatcher service dispatches document conversions to other convert services. It exposes the following custom metrics additionally:

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_jobs_per_state_total: This counter metric represents the total number of jobs per state. It has a label state which indicates the state of the job.

  • out_ngn_printer_locks: This gauge metric represents the number of printer locks per service.

seal-copier

The seal-copier service is responsible for creating copies for printers that are not able to do so. It exposes the following custom metrics additionally:

  • out_ngn_copies_total: This counter metric represents the total number of copies.

seal-ghost

The seal-ghost service calls the Ghostscript to convert postscript to printer language. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_parallel_processes: This gauge metric represents the number of currently parallel running converter processes.

  • out_ngn_requested_processes: This gauge metric represents the number of requested converter processes.

seal-housekeeper

The seal-housekeeper service is responsible for cleaning up old print jobs. It exposes the following custom metrics additionally:

  • out_ngn_jobs_deleted_total: This counter metric represents the total number of deleted jobs from the database.

  • out_ngn_files_deleted_total: This counter metric represents the total number of deleted files from the database.

  • out_ngn_chunks_deleted_total: This counter metric represents the total number of deleted chunks from the database.

  • out_ngn_notifications_deleted_total: This counter metric represents the total number of deleted notifications from the database.

  • out_ngn_locks_deleted_total: This counter metric represents the total number of deleted locks from the database.

seal-ipp-checkin

The seal-ipp-checkin service is the entry point for IPP jobs. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_job_filesize_bytes: This histogram metric represents the filesize of incoming jobs in bytes.

seal-job-notifier

The seal-job-notifier service sends job status notifications to the configured destinations. It exposes the following custom metrics additionally:

  • out_ngn_rest_notifications_total: This counter metric represents the total number of successfully sent REST notifications.

seal-mainland-checkout

The seal-mainland-checkout service is responsible for sending the print job to the seal-island-checkout on remote sites. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_connected_clients: This gauge metric represents the number of connected clients.

  • out_ngn_last_time_connected: This gauge metric represents the last time a client was connected.

  • out_ngn_last_time_disconnected: This gauge metric represents the last time a client has disconnected.

seal-out-ngn-accounting

The seal-out-ngn-accounting service is responsible for logging accounting information. It exposes the following custom metrics additionally:

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

seal-out-ngn-message-relay

The seal-out-ngn-message-relay service is a relay service for the transactional outbox pattern. It exposes the following custom metrics additionally:

  • out_ngn_message_relay_total: This counter metric represents the total number of messages relayed by the service.

seal-pjl-checkout

The seal-pjl-checkout service is responsible for sending the print job to the printer using the PJL protocol. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

seal-print-preview

The seal-print-preview service is responsible for generating print previews. It exposes the following custom metrics additionally:

  • out_ngn_bytes_total: This counter metric represents the total number of bytes received by the service.

  • out_ngn_duration_seconds: This histogram metric represents the duration of the processing time in seconds.

  • out_ngn_documents_total: This counter metric represents the total number of documents processed by the service.

  • out_ngn_parallel_processes: This gauge metric represents the number of currently parallel running converter processes.

  • out_ngn_requested_processes: This gauge metric represents the number of requested converter processes.

Other services like seal-rest, seal-printer-monitor or seal-virtual-queues do not expose custom metrics but can be monitored using the default metrics.

Custom Metrics JSON

[
  {
    "service": "seal-bodyscanner",
    "metricsUrl": "https://<host>:1988/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-checkin",
    "metricsUrl": "https://<host>:1948/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      }
    ]
  },
  {
    "service": "seal-checkout",
    "metricsUrl": "https://<host>:1998/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-co-notifier",
    "metricsUrl": "https://<host>:2098/metrics",
    "metrics": [
      {
        "name": "out_ngn_sap_notifications_total",
        "help": "Counter for successfully sent SAP notifications",
        "type": "counter",
        "labels": [
          "destination"
        ]
      }
    ]
  },
  {
    "service": "seal-controller",
    "metricsUrl": "https://<host>:1969/metrics",
    "metrics": [
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_jobs_per_state",
        "help": "Total number of jobs per state",
        "type": "counter",
        "labels": [
          "state"
        ]
      },
      {
        "name": "out_ngn_printer_locks",
        "help": "Gauge for printer locks per service",
        "type": "gauge"
      },
      {
        "name": "out_ngn_printer_queue_length",
        "help": "Gauge for printer queue length",
        "type": "gauge",
        "labels": [
          "printername"
        ]
      }
    ]
  },
  {
    "service": "seal-convert-dispatcher",
    "metricsUrl": "https://<host>:1958/metrics",
    "metrics": [
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_jobs_per_state",
        "help": "Total number of jobs per state",
        "type": "counter",
        "labels": [
          "state"
        ]
      },
      {
        "name": "out_ngn_printer_locks",
        "help": "Gauge for printer locks per service",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-ps2pdf",
    "metricsUrl": "https://<host>:1908/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-pdfstamp",
    "metricsUrl": "https://<host>:1918/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-pdf2ps",
    "metricsUrl": "https://<host>:1928/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-sapgof",
    "metricsUrl": "https://<host>:1938/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-pdfscale",
    "metricsUrl": "https://<host>:2088/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-convert-tiff2pdf",
    "metricsUrl": "https://<host>:2108/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-copier",
    "metricsUrl": "https://<host>:2028/metrics",
    "metrics": [
      {
        "name": "out_ngn_copies_total",
        "help": "Total number of copies",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-ghost",
    "metricsUrl": "https://<host>:1978/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-housekeeper",
    "metricsUrl": "https://<host>:2198/metrics",
    "metrics": [
      {
        "name": "out_ngn_jobs_deleted_total",
        "help": "Number of jobs deleted from the database",
        "type": "counter"
      },
      {
        "name": "out_ngn_files_deleted_total",
        "help": "Number of files deleted from the database",
        "type": "counter"
      },
      {
        "name": "out_ngn_chunks_deleted_total",
        "help": "Number of chunks deleted from the database",
        "type": "counter"
      },
      {
        "name": "out_ngn_notifications_deleted_total",
        "help": "Number of notifications deleted from the database",
        "type": "counter"
      },
      {
        "name": "out_ngn_locks_deleted_total",
        "help": "Number of locks deleted from the database",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-ipp-checkin",
    "metricsUrl": "https://<host>:632/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_job_filesize_bytes",
        "help": "Histogram for filesize of incoming jobs",
        "type": "histogram"
      }
    ]
  },
  {
    "service": "seal-job-notifier",
    "metricsUrl": "https://<host>:8082/metrics",
    "metrics": [
      {
        "name": "out_ngn_rest_notifications_total",
        "help": "Counter for successfully sent REST notifications",
        "type": "counter",
        "labels": [
          "destination"
        ]
      }
    ]
  },
  {
    "service": "seal-mainland-checkout",
    "metricsUrl": "https://<host>:2118/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_connected_clients",
        "help": "Number of connected clients",
        "type": "gauge"
      },
      {
        "name": "out_ngn_last_time_connected",
        "help": "Last time a client connected",
        "type": "gauge"
      },
      {
        "name": "out_ngn_last_time_disconnected",
        "help": "Last time a client disconnected",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-out-ngn-accounting",
    "metricsUrl": "https://<host>:2048/metrics",
    "metrics": [
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-out-ngn-message-relay",
    "metricsUrl": "https://<host>:2068/metrics",
    "metrics": [
      {
        "name": "out_ngn_message_relay_total",
        "help": "Total number of sent message from out_ngn message relay",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-pjl-checkout",
    "metricsUrl": "https://<host>:2078/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      }
    ]
  },
  {
    "service": "seal-print-preview",
    "metricsUrl": "https://<host>:2018/metrics",
    "metrics": [
      {
        "name": "out_ngn_bytes_total",
        "help": "Total number of bytes processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_duration_seconds",
        "help": "Duration of document processing",
        "type": "histogram"
      },
      {
        "name": "out_ngn_documents_total",
        "help": "Total number of documents processed by the service",
        "type": "counter"
      },
      {
        "name": "out_ngn_parallel_processes",
        "help": "Number of currently parallel running converter processes",
        "type": "gauge"
      },
      {
        "name": "out_ngn_requested_processes",
        "help": "Number of requested converter processes",
        "type": "gauge"
      }
    ]
  },
  {
    "service": "seal-printer-monitor",
    "metricsUrl": "https://<host>:2008/metrics",
    "metrics": []
  },
  {
    "service": "seal-rest",
    "metricsUrl": "https://<host>:8080/metrics",
    "metrics": []
  },
  {
    "service": "seal-virtual-queues",
    "metricsUrl": "https://<host>:2058/metrics",
    "metrics": []
  }
]

Default Metrics

Additionally to the custom metrics provided by the services, you can utilize the standard metrics provided by the Node.js prom-client to measure the overall health of your servers.

[
  {
    "name": "process_cpu_user_seconds_total",
    "help": "Total user CPU time spent in seconds.",
    "type": "counter"
  },
  {
    "name": "process_cpu_system_seconds_total",
    "help": "Total system CPU time spent in seconds.",
    "type": "counter"
  },
  {
    "name": "process_cpu_seconds_total",
    "help": "Total user and system CPU time spent in seconds.",
    "type": "counter"
  },
  {
    "name": "process_start_time_seconds",
    "help": "Start time of the process since unix epoch in seconds.",
    "type": "gauge"
  },
  {
    "name": "process_resident_memory_bytes",
    "help": "Resident memory size in bytes.",
    "type": "gauge"
  },
  {
    "name": "process_virtual_memory_bytes",
    "help": "Virtual memory size in bytes.",
    "type": "gauge"
  },
  {
    "name": "process_heap_bytes",
    "help": "Process heap size in bytes.",
    "type": "gauge"
  },
  {
    "name": "process_open_fds",
    "help": "Number of open file descriptors.",
    "type": "gauge"
  },
  {
    "name": "process_max_fds",
    "help": "Maximum number of open file descriptors.",
    "type": "gauge"
  },
  {
    "name": "nodejs_eventloop_lag_seconds",
    "help": "Lag of event loop in seconds.",
    "type": "gauge"
  },
  {
    "name": "nodejs_eventloop_lag_min_seconds",
    "help": "The minimum recorded event loop delay.",
    "type": "gauge"
  },
  {
    "name": "nodejs_eventloop_lag_max_seconds",
    "help": "The maximum recorded event loop delay.",
    "type": "gauge"
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