GCP PubSub data input configuration fields

  • Release version: Washingtondc
  • Updated February 1, 2024
  • 4 minutes to read
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    Summary of GCP PubSub Data Input Configuration Fields

    This guide provides detailed descriptions of the configuration fields required for setting up Google Cloud Pub/Sub data inputs in ServiceNow Health Log Analytics. Proper configuration enables effective log data streaming, which is crucial for monitoring and analysis.

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    Key Features

    • Name: Required field for the data input name.
    • Port: Select a unique port for the MID Server; ensure it is opened by the security team.
    • Execute on: Option to choose between a specific MID Server or a MID Server cluster.
    • MID Server: Specify the MID Server for log streaming; supports only basic authentication.
    • MID Server Cluster: Use a failover MID Server cluster; must contain MID Servers with log ingestion enabled.
    • Application Service: Required field to bind log data to the application service.
    • Transport: Indicates the protocol used for log data transmission (PubSub).
    • GCP Credential Alias: Select or create a credential alias for authentication.
    • Subscriber Thread Pool Size: Configurable number of concurrent threads for downloading logs.
    • Rate Limit: Set a maximum number of events processed per second.

    Key Outcomes

    By accurately filling out the configuration fields, customers can ensure seamless log data transmission from Google Cloud Pub/Sub to ServiceNow. This setup helps in maintaining operational visibility and enhances the analytics capabilities of Health Log Analytics.

    Description of the fields on the GCP PubSub data input configuration form.

    Basic configuration

    Field Description
    Name Name of the new data input. This field is required.
    Port The port for the MID Server.

    Select a unique port from the array. The placeholder shows the range of ports from which to choose. Make sure that your organization’s security team opens the selected port.

    This field is required.
    Execute on Option to determine whether to use a specific MID Server or a MID Server cluster.

    This feature is supported in the Health Log Analytics application, Version 26.0.17 - February 2023 and later, available from the ServiceNow Store.
    MID

    (Only when the Execute on field is set to Specific MID Server)

    The MID Server to which the logs are streamed.
    Note:
    • You can select only MID Servers with log ingestion capability that support basic authentication. MID Servers that support mTLS are not listed.
    • The default maximum number of data inputs streaming logs to a single MID Server is 10. You can modify this number in the MID Server properties.
    • If log ingestion is not enabled for the selected MID Server, Health Log Analytics enables it automatically.
    This field is required.
    MID Server Cluster

    (Only when the Execute on field is set to Specific MID Server Cluster)

    The MID Server cluster to which the log data is pulled.

    The data input runs on a single MID Server in the cluster until that MID Server fails. The system then moves all the data input tasks to the next available MID Server in the cluster according to the configured order.

    This feature is supported in the Health Log Analytics application, Version 26.0.17 - February 2023 and later, available from the ServiceNow Store.

    Note:
    • Health Log Analytics supports only failover MID Server clusters. In these clusters, multiple MID Servers are grouped together for failover protection. When selecting a cluster from the data input form, the MID Server Clusters list displays only failover clusters.
    • The MID Server cluster must include only MID Servers that support basic authentication. mTLS is not supported for log ingestion.
    • Log ingestion must be enabled for each MID Server in the cluster. If log ingestion is not enabled for the active MID Server, Health Log Analytics enables it automatically.
    • The default maximum number of data inputs streaming logs to a single MID Server is 10. A cluster passes capacity validation if it contains at least one MID Server with fewer than 10 data inputs running on it, even when that MID Server is down.
    For more information about MID Server clusters, see Configure a MID Server cluster.

    This field is required.
    Application service The application service to which to bind the log data. This field is required.
    Note:
    If no relevant application service exists, Create an application service and add CIs to it. Set the status of the new application service to Operational.

    The fields in the following table show read-only information.

    Field Description
    Transport Protocol used to send the log data: PubSub.
    Sources count The number of log sources this data input has created.
    Status Status of the data input.
    Disabled since The time when the data input stopped or failed.
    Last log time The time when the last log streamed in the data input.
    Table 1. Transport tab
    Field Description
    Project ID The project ID of the Google Cloud project. For example, my-project-id.
    Topic Name The Google Cloud Pub/Sub topic to which to subscribe Health Log Analytics. For example, my_topic.
    GCP Credential Alias The credential alias to be used.

    Specify one GCP credential alias by selecting the magnifying glass icon and then either selecting an existing credential alias from the Connection & Credential Aliases list, or selecting New to create a new record. The default is sn_occ.HLA_Credential_Alias.

    For information about creating a credential alias, see Credential aliases for Discovery.
    Subscription Name The subscription Health Log Analytics uses to receive log data that is published on the Google Cloud Pub/Sub topic.

    If you leave this field blank, Health Log Analytics uses ServiceNow-Subscription.

    Advanced configuration

    Table 2. Advanced tab
    Field Description Default value
    Subscriber Thread Pool Size The number of concurrent threads that are downloading files from the Google Cloud Pub/Sub topic. 1
    Default timezone The default time zone of events. The system uses this default when the log does not specify a time zone. GMT
    Max length in bytes The maximum length of log messages, in bytes. 32,766
    Character encoding (Read-only) The character encoding for this data input. UTF-8
    Sub sample drop ratio The ratio of events to drop. -1
    Sub sample receive ratio The ratio of events to receive. -1
    Rate limit The maximum number of events per second that this data input processes. -1
    Drop if queue is full Option for selecting to discard logs if many processes are waiting in the queue to access the MID Server. Clear