Glossary of Centreon Log Management terms
Alert rule​
A set of conditions that indicate when a problem is occurring. When these conditions are met, an alert event is created and shown on the Alerts > Alert events page.
Alert event​
The record generated when an alert rule condition is met. The alert event is given a status based on the criteria you've defined. Alert events are shown on the Alerts > Alert events page. Possible alert statuses are:
- CRITICAL
- ERROR
- WARNING
- OK
- UNKNOWN
Service​
What produced the log. Examples: Apache, HTTPD, MySQL, Syslog, Postgres, Grafana... This information is provided by the ServiceName OpenTelemetry attribute.
service_namespace [TBC]​
A label for a set of services. Example: e-commerce site.
Custom attributes​
Custom attributes are key–value pairs that you add yourself to logs to provide extra context that isn't included by default. They let you describe business-specific, application-specific, or domain-specific details that OpenTelemetry doesn't define in its standard attribute set.
Severity​
Across most tools and platforms, logs are presented using log levels like INFO or ERROR — the format end users are most familiar with. In OpenTelemetry, this information is managed using two attributes: SeverityNumber (the severity's ID) and SeverityText (the severity's label). One SeverityText value corresponds to several SeverityNumbers.
In CLM, all queries are based on the SeverityNumber attribute. However, the labels shown always follow the OpenTelemetry standard. If your device uses different labels in its SeverityText attribute, those labels will be ignored. This prevents duplicates or inconsistent entries in the severity list - you'll only ever see logs with a DEBUG, INFO, WARN, ERROR, or FATAL severity.
Here is the range of severity numbers that CLM takes into account (the descriptions are those of the OpenTelemetry documentation):
| SeverityNumber range | Name | Description |
|---|---|---|
| 5-8 | DEBUG | A debugging event. |
| 9-12 | INFO | An informational event. Indicates that an event happened. |
| 13-16 | WARN | A warning event. Not an error but is likely more important than an informational event. |
| 17-20 | ERROR | An error event. Something went wrong. |
| 21-24 | FATAL | A fatal error such as application or system crash. |
Some tools may not include a severity number at all in their logs. Any log entry received without a severity number is given by CLM the severity number 0 (UNSPECIFIED).
Event​
Log event​
A log event is a log entry.
See also Alert event.
Telemetry​
"Telemetry" is when a system sends information about what it's doing to another system so people can see and understand what's going on.