How log management works
Agents or APIs forward logs to a central platform, where they are normalized into a common format, time-synchronized and indexed for search. Typical sources include operating systems, firewalls, identity providers, email, cloud services and business applications.
Collected data is retained according to policy, protected against tampering through access controls and integrity checks, and analyzed with queries, dashboards and correlation rules. Alerts from the analysis guide security teams to events needing attention. Log volume can grow quickly, so tiered storage, filtering of low-value noise and compression help keep costs under control without discarding data that investigators may need.
Why it matters for Canadian organizations
Without logs, organizations often cannot tell how an intruder got in or what data was touched. That uncertainty complicates breach assessments and notifications under PIPEDA and Quebec Law 25, and may prolong recovery.
Frameworks such as PCI DSS and ISO 27001, and regulatory expectations like OSFI B-13, require logging and retention. Attackers frequently delete or alter logs, so central, protected copies are important. Time accuracy is critical, because correlating events across systems depends on consistent timestamps, and a drifting clock can make reconstruction of an incident unreliable.
How to implement it
Decide which sources matter most, starting with identity, endpoints, network boundary, email and critical applications. Synchronize clocks and use consistent formats.
Set retention periods based on legal and investigative needs, restrict who can modify logs, and write detection rules for the events that matter. Route logs into a SIEM and ensure someone monitors the output, since collected but unwatched logs give little protection. Test your ability to answer practical questions, such as who logged in from where last week, to confirm that logging actually supports real investigations.
Frequently asked questions
What is the difference between log management and SIEM?
Log management focuses on collecting, storing and searching logs. A SIEM builds on that with correlation, alerting, threat intelligence and case workflows for security use. Many SIEMs include log management, but not all log tools provide security analytics.
How long should logs be retained?
Retention depends on legal, regulatory, contractual and investigative needs. Some standards specify minimum periods, and intrusions are often discovered long after they begin, so many organizations keep security-relevant logs for a year or more, with recent data readily searchable.
Which logs are most important for security?
Authentication and identity logs, endpoint and server events, firewall and network logs, email and cloud audit logs, and application logs for critical systems. Prioritize sources that show access to sensitive data and administrative changes.
Related service: SIEM