4/9/2023 0 Comments Emergency 20 levels![]() ![]() Having the right density of Trace messages makes software much more maintainable but requires some diligence because the value of individual Trace statements may change over time as programs evolve. Trace: Trace is by far the most commonly used severity and should provide context to understand the steps leading up to errors and warnings. We typically have < 5% Info messages relative to Trace. ![]() Viewing a log showing Info and above should give a quick overview of major state changes in the process providing top-level context for understanding any warnings or errors that also occur. Info: This is important information that should be logged under normal conditions such as successful initialization, services starting and stopping or successful completion of significant transactions. For example, loss of network access should be a warning or even an error in a server application, but might be just an Info in a desktop app designed for occasionally disconnected laptop users. Warnings should be used sparingly so that they don't become meaningless. Viewing a log filtered to show only warnings and errors may give quick insight into early hints at the root cause of a subsequent error. For example, expected transient environmental conditions such as short loss of network or database connectivity should be logged as Warnings, not Errors. Warning: This MIGHT be problem, or might not. ![]() For example, this metric might help inform decisions about whether or not another beta testing cycle is needed before a release. Tracking error rates as versus application usage can yield useful quality metrics such as MTBF which can be used to assess overall quality. By filtering a log to look at errors and above you get an overview of error frequency and can quickly identify the initiating failure that might have resulted in a cascade of additional errors. SysAdmin should be notified automatically, but doesn't need to be dragged out of bed. Typically, a Fatal error only occurs once in the process lifetime, so if the log file is tied to the process, this is typically the last message in the log.Įrror: Definitely a problem that should be investigated. If it's happening daily and that's not a BFD, it has lost its meaning. Since we prefer our SysAdmins alert and well-rested, this severity should be used very infrequently. I find it more helpful to think about severities from the perspective of viewing the log file.įatal/Critical: Overall application or system failure that should be investigated immediately. I reserve these only for the most heinous errors and situations where there is guaranteed to have been data corruption or loss. Fatal - Any error that is forcing a shutdown of the service or application to prevent data loss (or further data loss). ![]() These are usually reserved (in my apps) for incorrect connection strings, missing services, etc. These errors will force user (administrator, or direct user) intervention.
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