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+# Log Files and Real-Time Alerts
+
+| ADR Info            | Details                   |
+|---------------------|---------------------------|
+| Subject             | Log files and real-time alerts |
+| ADR Number          | 020                       |
+| Status              | Proposed                  |
+| Author              | Marina                    |
+| Date                | 28.10.2024                |
+
+
+## Context
+In order to have a more effective overview of the orchestration in the pipeline, there is a need for better handling of log files and implementing real-time alerts which would allow for timely and relevant error handling for critical issues. 
+
+
+## Decision
+To implement a real-time alert and notification system which will distribute alerts through specific channels (eg. Slack, email, W&B, Prefect), targeted at particular audiences (eg. Infrastructure, MD&D, individual) depending on the type of alert being handled. 
+
+
+### Overview
+
+Alert channels: Slack, email, Prefect and Weights&Biases
+
+Logging levels: INFO, WARNING, ERROR, CRITICAL
+
+Audience: MD&D, Infrastructure, Outreach, monthly-run responsible 
+
+| Channel | Threshold        | Alert Type                         | Audience                  |
+|---------|-------------------|------------------------------------|---------------------------|
+| Slack   | ERROR, CRITICAL   | Real-Time, Short Summary + Link to Full Log | MD&D, Infrastructure      |
+| Email   | ERROR, CRITICAL   | Real-Time, Expanded Summary       | MD&D, Infrastructure      |
+| Prefect | ALL               | Real-Time, Workflow Status        | MD&D, Infrastructure, Outreach |
+| W&B     | ALL               | Performance Metrics               | MD&D, Infrastructure, Outreach |
+
+
+For alert prioritization, "critical" and "non-critical" alerts are separated, with critical alerts stemming from logging levels ERROR and CRITICAL. 
+
+
+## Consequences
+
+**Positive Effects:**
+- Real-time alerts allow for timely handling of errors which may be critical 
+- Alerts can reach their target audiences immediately which limits time and makes information flows more direct and effective 
+- Having real-time alerts is useful in generating a record of (reoccuring) issues in the pipeline 
+- Increased transparency
+
+
+**Negative Effects:**
+- Alerts must be set up in a way to be concise and informative in order to be useful, with carefully chosen levels of detail to avoid "alert fatigue"
+- The audience for each type of alert must be carefully selected in order for alerts to stay relevant 
+- Potential increase in maintanence work 
+
+## Rationale
+Easier, quicker and more efficient handling of potential issues, errors or obstacles in the pipeline. Additionally, a better overview of the pipeline orchestration process. 
+
+### Considerations
+
+Implementation: 
+- how the channels are integrated with the logger
+- what types of events or errors trigger alerts at each logging level 
+- testing accuracy and reliability of the alerts
+
+Maintaining: 
+- Should logs be archived or deleted? If so, which ones and when? Log rotation system? 
+- The levels of the tresholds may have to be adjusted over time in order to fine-tune the alerts. Thus, it is good to have a periodic review of how (in)effective they are.
+- Audience responsibility: possibly develop guidelines which alerts require which audience to act. This can keep everyone in the loop, yet maintain clarity on individual tasks and responsibilities
+- In the long-term make sure that the alerts are being distributed to the (still) relevant audiences, and adjust accordingly
+- Alert noise reduction: introduce possible ways of grouping similar or related alerts in order to avoid alert channel overflows 
+
+## Additional Notes
+This ADR relates to *insert all other log and alert ADRs* 
+
+## Feedback and Suggestions
+
+