Watching graphs is a passive activity, and a monitoring practice built only on dashboards depends on a person being there to look. The more capable parts of observability are the ones that let the platform notice things and react on its own, without waiting for a human to glance at a screen. On OCI this rests on two complementary capabilities. Events is the mechanism by which the platform detects that something has happened, a resource was created, a state changed, a threshold was crossed. Notifications is the mechanism by which word of something is delivered to where it needs to go, whether that is a person, a chat channel, or another system. Understanding how these two work, separately and together, is the difference between a monitoring setup that merely displays and one that acts.
What Events detects
Events is concerned with things that happen. Across an OCI estate, resources are constantly changing state, being created and destroyed, starting and stopping, succeeding and failing, and each of these is something that happened that another part of the system might care about. Events makes these happenings available to be acted on. Rather than a person having to poll and check whether something occurred, Events surfaces the occurrence itself, so that a rule can be set to respond to it. This is a shift from asking repeatedly whether something has changed to being told when it does, and it is the foundation of reacting promptly rather than on the next scheduled check. The value is that the platform itself tells you when the things you care about happen, instead of you having to go and look.
What Notifications delivers
Notifications handles the other half, getting word of something to where it needs to be. A notification has somewhere to go, and the model is built around topics that interested parties subscribe to. When a message is published to a topic, everyone and everything subscribed to that topic receives it, whether that is an email to a person, a message to a chat system, or a call to another service that will act on it. This separation of publishing from subscribing is what makes the system flexible, because the thing producing the message does not need to know who is listening, and the listeners can be changed without touching the producer. It means you can add a new recipient to an alert without modifying whatever raises the alert.
| Capability | What it handles | The question it answers |
|---|---|---|
| Events | Detecting that something happened | What changed in the estate? |
| Notifications | Delivering word to subscribers | Who or what should hear about it? |
| Rule | Connecting an event to an action | When this happens, do that |
Combining the two into automation
The real power appears when Events and Notifications are joined, because then a thing that happens can trigger a response with no human in the loop. A rule watches for a particular kind of event, and when that event occurs the rule publishes a notification, which reaches whoever or whatever is subscribed. At its simplest this means a person is emailed when something important happens. More interestingly, the subscriber can be another system, a function that takes an action, so that the occurrence of an event automatically triggers a remediation. A resource enters a bad state, an event fires, a rule catches it, a function runs, and the problem is addressed before anyone was even aware of it. This is the path from monitoring that informs to operations that self correct, and it begins with the simple combination of detecting a happening and delivering word of it.
A framework for using Events and Notifications
These capabilities are most useful when applied deliberately rather than scattered across the estate.
- Decide what happenings matter. Identify the events worth reacting to, the state changes and failures that should prompt a response, and ignore the rest to avoid noise.
- Organise topics by audience. Set up notification topics around who needs to hear what, so each recipient gets the messages relevant to them and no more.
- Connect events to topics with rules. Write rules that catch the events that matter and publish to the right topic, keeping the mapping clear and maintained.
- Route urgency appropriately. Send genuinely urgent events to a paging path and routine ones to a quieter channel, the same discipline that prevents alert fatigue.
- Automate where it is safe. For well understood conditions, subscribe an automated action rather than a person, so the response is immediate and consistent.
Applied this way, Events and Notifications become the connective tissue that turns isolated observations into prompt, appropriate, and sometimes automatic responses.
The link to alarms and monitoring
Events and Notifications do not stand alone. They are the delivery and reaction machinery that the rest of monitoring relies on. When an alarm fires, it is Notifications that carries the word to the people who need it. When you want a change in the estate to trigger a response, it is Events that detects the change. They sit beneath the visible parts of monitoring, the dashboards and the alarms, making the reactions actually happen. Because they are the path by which alerts reach people, they are also where the discipline of avoiding noise has to be applied, routing the urgent to where it will wake someone and the routine to where it will simply be seen. This connects them tightly to the wider practice described in the complete monitoring and observability guide.
From watching to acting
The step from a monitoring setup that watches to one that acts runs through Events and Notifications. Events gives the platform the ability to notice that something happened, Notifications gives it the ability to deliver word of it, and together they let observations turn into responses, from a simple email all the way to automatic remediation. Building them deliberately, around the happenings that matter and the audiences that need to know, is what makes a monitoring estate proactive rather than merely descriptive. They are a core part of the practice in the complete monitoring and observability guide, and they pair naturally with the discipline of tuning alarms so that what gets delivered is worth delivering. When you want your OCI estate to react to its own changes rather than wait for someone to notice, our OCI monitoring and observability practice wires Events and Notifications into a coherent response system.
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