nebula-logger-instrumentation

name	nebula-logger-instrumentation
description	Use this skill when the user wants to add or update Nebula Logger instrumentation in Apex, LWC, Aura, Flow, or OmniStudio. Covers logging APIs, save patterns, record association, scenarios, tags, async transaction linking, and save method selection.

Instrumenting Code with Nebula Logger

Supported API Surface

Nebula Logger's supported API surface is everything marked global in Apex, and everything exported from the c/logger LWC module. The managed package (namespace Nebula) exposes only the global surface; the unlocked package technically exposes public classes and methods too, since there's no namespace boundary blocking access.

Do not rely on public Apex classes or methods from your own code. They are internal to Nebula Logger and can change, be renamed, or be removed in any release without a deprecation window. LoggerDataStore, LoggerConfigurationSelector, LogEntryHandler, LoggerPlugin (the class itself, not the LoggerPlugin__mdt records), and everything else without a global modifier is subject to change without notice.

If a capability you need isn't available through the global surface, file an issue at https://github.com/jongpie/NebulaLogger/issues rather than reaching into public methods. This skill and its companions only reference global APIs.

The Core Model

Every Nebula Logger runtime context follows the same pattern:

1. Add one or more log entries at a level (ERROR, WARN, INFO, DEBUG, FINE, FINER, FINEST).
2. Optionally enrich each entry with a record, exception details, or tags.
3. Persist the buffered entries by calling saveLog() once at the end of the transaction.

The rest of this skill shows what that looks like in each runtime context.

Cross-Cutting Concepts

Logging levels

Every context supports these seven levels: ERROR, WARN, INFO, DEBUG, FINE, FINER, FINEST. Which levels actually persist depends on the effective LoggerSettings__c.LoggingLevel__c for the user - see nebula-logger-install for the hierarchy setup and nebula-logger-best-practices for level selection guidance.

Scenarios and tags

Scenarios coarsely group a whole transaction under a business process; tags finely slice individual entries. Both are supported across every runtime.

• Set the transaction scenario once with setScenario('Order Fulfillment').
• Attach tags per-entry: chain .addTag('inventory') off the level-specific call.

Record association

Prefer structured record association (setRecord(...)) over embedding IDs in message strings. Nebula Logger stores a JSON snapshot of the record so the log page can render the record's state at the time of the entry.

Async transaction linking

Async work (batch, queueable, scheduled) runs in a new Apex transaction, which by default produces an unrelated Log__c. To link a child transaction back to its parent:

• Capture the parent's transaction ID with Logger.getTransactionId().
• Pass it to the child, then call Logger.setParentLogTransactionId(parentId) at the start of the child transaction.

This creates a ParentLog__c link between the two Log__c records so investigation can walk the chain.

Apex

Use level-specific methods to add entries, then persist once with Logger.saveLog().

public with sharing class InvoiceService {
  public static void processInvoice(Id invoiceId) {
    try {
      Logger.info('Starting invoice processing for ' + invoiceId);
      Logger.debug('Loading invoice and related records');

      // Business logic here

      Logger.info('Invoice processing completed successfully');
    } catch (System.Exception ex) {
      Logger.error('Invoice processing failed', ex);
      throw ex;
    } finally {
      Logger.saveLog();
    }
  }
}

Exception logging

Logger.exception(...) writes an ERROR log entry with the full exception context, saves the log, and rethrows the exception in one call. Do not add a separate Logger.saveLog() or throw ex; after it - both are redundant (and the throw is unreachable, since Logger.exception(...) already threw).

try {
  update accountsToUpdate;
} catch (System.DmlException ex) {
  Logger.exception('Failed to update accounts', ex);
}

If you want to log the exception but decide separately whether to rethrow it, use Logger.error(message, ex) with an explicit Logger.saveLog() and throw:

try {
  update accountsToUpdate;
} catch (System.DmlException ex) {
  Logger.error('Failed to update accounts', ex);
  Logger.saveLog();
  throw ex;
}

Attaching records

Schema.Account acct = [SELECT Id, Name FROM Account WHERE Id = :accountId LIMIT 1];

Logger
  .warn('Credit check returned warnings')
  .setRecord(acct)
  .addTag('credit-check')
  .addTag('customer-onboarding');

Logger.saveLog();

setRecord(...) is defined on LogEntryEventBuilder (returned by Logger.info(...) / Logger.warn(...) / etc.), not on Logger itself. Global overloads include setRecord(SObject), setRecord(Id), setRecord(List<SObject>), setRecord(Map<Id, SObject>), setRecord(System.Iterable<Id>), and setRecordId(Id). Chain them off the level-specific call as shown above.

Async parent/child linking

public with sharing class ParentQueueable implements System.Queueable {
  public void execute(System.QueueableContext context) {
    String parentTransactionId = Logger.getTransactionId();
    Logger.info('Parent job started');
    Logger.saveLog();

    System.enqueueJob(new ChildQueueable(parentTransactionId));
  }
}

public with sharing class ChildQueueable implements System.Queueable {
  private final String parentLogTransactionId;

  public ChildQueueable(String parentLogTransactionId) {
    this.parentLogTransactionId = parentLogTransactionId;
  }

  public void execute(System.QueueableContext context) {
    Logger.setParentLogTransactionId(this.parentLogTransactionId);
    Logger.info('Child job linked to parent log transaction');
    Logger.saveLog();
  }
}

Optional dependency via CallableLogger

Code that wants to log to Nebula Logger when it's installed but not hard-depend on it - for example, ISV packages that want to emit rich telemetry in customer orgs that happen to have Nebula Logger, without requiring every customer to install it - should call CallableLogger dynamically via System.Callable instead of referencing the Logger class directly.

CallableLogger is global in both the unlocked and managed packages, and it exposes every logging operation as a string action with a Map<String, Object> input. Because the caller never compile-time-references Logger, the calling package compiles and installs cleanly whether Nebula Logger is present or not.

public with sharing class OptionalLogger {
  // An example of how to dynamically check first for the managed package ('Nebula' namespace), then the unlocked package (no namespace)
  private static final System.Type CALLABLE_LOGGER_TYPE = System.Type.forName('Nebula', 'CallableLogger') ?? System.Type.forName('CallableLogger');

  public static void info(String message) {
    logEntry(System.LoggingLevel.INFO, message);
  }

  public static void error(String message, System.Exception apexException) {
    Map<String, Object> input = new Map<String, Object>{
      'loggingLevel' => System.LoggingLevel.ERROR.name(),
      'message' => message,
      'exception' => apexException,
      'saveLog' => true
    };
    invoke('newEntry', input);
  }

  private static void logEntry(System.LoggingLevel level, String message) {
    invoke('newEntry', new Map<String, Object>{ 'loggingLevel' => level.name(), 'message' => message, 'saveLog' => true });
  }

  private static void invoke(String action, Map<String, Object> input) {
    if (CALLABLE_LOGGER_TYPE == null) {
      return;
    }
    System.Callable logger = (System.Callable) CALLABLE_LOGGER_TYPE.newInstance();
    logger.call(action, input);
  }
}

Callers of OptionalLogger.info(...) / OptionalLogger.error(...) get logging in orgs that have Nebula Logger installed and a no-op in orgs that don't - no runtime error, no compile-time dependency, no post-install step for the customer.

Supported actions on CallableLogger

Every action accepts a Map<String, Object> and returns a Map<String, Object> output (with keys isSuccess, transactionId, parentLogTransactionId, requestId, and error details on failure).

Action	Purpose
newEntry	Add a log entry. Supports every enrichment key in the table below.
saveLog	Persist buffered entries. Optionally accepts saveMethodName.
getTransactionId	Return the current transaction ID (for async parent/child linking).
getParentLogTransactionId / setParentLogTransactionId	Read / set the parent transaction ID.
getScenario / setScenario / endScenario	Read / set / end the transaction's scenario.
tryCatch	Shorthand for newEntry with loggingLevel=ERROR and a serialized-input message; useful in generic catch blocks.

Supported input keys for newEntry

The same input keys are used by both the ISV pattern above and OmniStudio's Remote Action steps.

Key	Purpose
loggingLevel	Level name (INFO, ERROR, WARN, DEBUG, FINE, FINER, FINEST).
message	Entry message.
saveLog	Set to true to persist immediately after adding the entry.
saveMethodName	Override the save method for this call (EVENT_BUS, QUEUEABLE, REST, SYNCHRONOUS_DML).
tags	List<String> of tag names.
exception	System.Exception instance to attach.
recordId / record / recordList / recordMap	Record association, same shape as the Apex setRecord(...) overloads.
scenario	Scenario for the transaction.
parentLogTransactionId	Parent transaction ID for async linking.

LWC

Import getLogger from the c/logger module and call it once per component instance.

import { LightningElement } from 'lwc';
import { getLogger } from 'c/logger';

export default class PaymentPanel extends LightningElement {
  logger = getLogger();

  connectedCallback() {
    this.logger.setScenario('Payment UI');
    this.logger.info('Payment panel initialized');
    this.logger.saveLog();
  }

  async handleSave() {
    try {
      this.logger.debug('Submitting payment request');
      // async work
      this.logger.info('Payment submitted');
    } catch (error) {
      this.logger.error('Payment submit failed').setExceptionDetails(error);
    } finally {
      await this.logger.();
    }
  }
}

• getLogger() returns a scoped logger instance. Call it once and reuse.
• saveLog() is async - await it when the surrounding code needs the save to complete before returning.
• Level methods return a builder that supports .setRecord(...), .setExceptionDetails(...), .setScenario(...), and .addTag(...).

Aura

Embed the <c:logger> component in markup and access it via component.find('logger').

<aura:component>
  <c:logger aura:id="logger" />
</aura:component>

({
  handleRender: function (component) {
    const logger = component.find('logger');
    logger.info('Aura component initialized');
    logger.saveLog();
  },

  logButtonClick: function (component, event) {
    const logger = component.find('logger');
    logger.info('Save button clicked').addTag('user-action');
    logger.saveLog();
  }
});

Access the logger from handleRender or user-driven handlers rather than doInit. The embedded <c:logger> is an LWC-under-Aura, and LWC child methods are not yet available when doInit fires. If instrumentation must run at initialization time, wrap it in setTimeout(..., 0) so it runs after the render cycle.

Flow

Nebula Logger ships three invocable actions (all in the Logging category) plus a save action:

• Add Log Entry - Add a plain log entry with a message and logging level.
• Add Log Entry for an SObject Record - Add an entry linked to a single record.
• Add Log Entry for an SObject Record Collection - Add an entry linked to a collection of records.
• Save Log - Persist the buffered entries. End every flow path that added entries with this action.

Flow variable references pass through the invocable inputs using standard merge syntax ({!recordId}, {!Account.Name}, etc.). Set the scenario on any Add Log Entry* action to group the whole flow's entries under one business process.

OmniStudio

OmniStudio's OmniScripts and Integration Procedures log via the same CallableLogger class described under the Apex section's "Optional dependency" subsection. Instead of writing Apex, configure a Remote Action step in the OmniScript / IP:

• Remote Class: Nebula.CallableLogger if the managed package is installed, otherwise CallableLogger.
• Remote Method: newEntry to add an entry (optionally saving in the same call), or saveLog to persist pending entries. See the "Supported actions" and "Supported input keys" tables in the Apex section above for the full menu.
• Additional Input: pass the input keys declaratively. Anything in the input map beyond the known keys is appended to the entry's message as an "OmniStudio Input" block, so process-specific context flows into the log without extra plumbing.

CallableLogger automatically stamps OriginType__c = 'OmniStudio' and captures the omniProcessId from OmniStudio's default input so console filtering shows OmniStudio-sourced entries distinctly.

Save Method Selection Guide

Logger.SaveMethod values are EVENT_BUS, QUEUEABLE, REST, and SYNCHRONOUS_DML.

Save Method	Use when	Trade-off
EVENT_BUS (default)	General-purpose app logging	Depends on platform event capacity
QUEUEABLE	You want to defer work and reduce synchronous CPU pressure	Adds async dependency and queueable execution timing
REST	You need to avoid mixed-DML constraints in current context	Requires callout path and valid session context
SYNCHRONOUS_DML	You need immediate persistence and can tolerate rollback risk	Log inserts are rolled back if transaction fails

Override the default globally via LoggerSettings__c.DefaultSaveMethod__c, or per-transaction via Logger.saveLog(Logger.SaveMethod.QUEUEABLE).

Related Skills

• nebula-logger-testing-your-code - Testing code that calls the APIs above.
• nebula-logger-console - Browsing the log records these APIs produce.
• nebula-logger-best-practices - Team-wide instrumentation standards.