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A Linux remote monitoring and management (RMM) agent can see only what it is configured and able to collect. Polling reads a snapshot of current state; Linux Audit records events selected by rules; and eBPF programs can emit information from supported kernel hooks. None of those mechanisms, by itself, proves that an agent captures every event. Coverage depends on the agent’s configuration, permissions, kernel support, collection path, and delivery health.
What each collection method can reveal
The methods differ in whether they read current state or collect event-level data. An RMM product may use one or combine several; the label “RMM agent” does not establish what is enabled on a particular host.
| Method | How it collects | What determines visibility |
|---|---|---|
| Polling | Repeatedly reads exposed state, such as information available through procfs. | Which interfaces are queried, the sampling interval, and what exists at the instant of each read. |
| Linux Audit and auditd | The kernel generates records for activity selected by audit rules; the userspace daemon logs or forwards them. | Installed rules, audit controls, daemon health, and the ability to retain and deliver records. |
| eBPF | Programs attach to selected kernel hooks and emit chosen data for a userspace consumer. | Supported program and hook types, kernel and privilege support, program logic, buffer capacity, and consumer health. |
These are different collection models, not a ranking. An agent may combine them, and actual coverage has to be verified for the specific product and host.
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Polling is a snapshot, not a history of everything that happened between reads. Linux’s procfs documentation describes an interface for process and kernel information. An agent that reads procfs sees the information exposed when it performs that read.
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A process that starts and exits between polls may appear in neither snapshot. The same sampling limitation can apply to transient connections or brief file activity: if the agent does not read the relevant state while it exists, that snapshot will not show it. This is an inherent limit of sampling, not proof of a defect in a particular product.
Sampling also limits what absence can establish. The kernel’s workload-tracing guidance notes that observations cover the paths exercised by a workload. A snapshot or trace should therefore be understood in terms of the interval and workload observed; it does not prove that an unobserved event never occurred.
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What Linux Audit and auditd can show
Linux Audit is a framework, not just the auditd process. Its kernel component generates records based on system activity, while userspace components log, forward, inspect, or process those records. The Linux Audit subsystem overview explains this kernel-and-userspace architecture.
Audit rules determine which relevant activity is recorded. The audit.rules(7) manual describes control, file, and syscall rules. A relevant event can be recorded if the applicable rule is installed and functioning, but “auditd records everything by default” is not a safe assumption.
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Rules and system-call coverage
Syscall rules are evaluated against system calls made across the system. The manual warns that syscall rules affect performance and notes that combining syscalls where appropriate can reduce that cost. Broad coverage and lower overhead may therefore involve a configuration trade-off; the effect depends on the rules and workload.
Queueing, failure behavior, and delivery
Audit control settings include the kernel backlog queue, failure mode, and event-rate controls. These settings affect how the system behaves under event load or when records cannot be handled as expected. The existence of a rule alone does not establish that its record was retained or reached a remote console: daemon health, queue pressure, and forwarding are part of the path.
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What eBPF can show
eBPF is a programmable Linux mechanism for runtime instrumentation and extension. The kernel’s eBPF userspace API documentation describes areas such as networking, tracing, and Linux Security Module attachment. The BPF syscall documentation covers program attachment and querying attached programs for supported attach types.
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Event transfer and possible loss
A BPF ring buffer is one way to transfer event data from the kernel to userspace. The ring-buffer documentation describes a consumer that can wait for data. But the buffer transports only what the program writes, and onward delivery depends on the consumer handling it. Buffer capacity, filtering, and consumer behavior all matter; eBPF does not automatically retain every event.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to evaluate a named Linux RMM agent
Ask the vendor or inspect the host configuration. Product behavior cannot be inferred from generic Linux documentation alone; it depends on the agent release, supported distributions and kernels, and local settings.
- Polling: Which procfs or other state interfaces does the agent read, and at what cadence?
- Audit: Which audit rules are installed? Does the agent rely on the host’s existing rules or change them?
- eBPF: Which program types and attachment points are used, and which kernel releases and configurations are supported?
- Privileges: Which capabilities or privileges are required, and can they be narrowed?
- Event handling: How are kernel events filtered and transferred to userspace? Can administrators see buffer pressure, dropped events, permission failures, or unsupported hooks?
- Persistence and forwarding: Where are records stored, how are they forwarded, and what happens during a network outage, agent restart, or high event volume?
- Telemetry meaning: Does the documentation distinguish sampled inventory or health state from event-level telemetry?
How to interpret an agent’s visibility claims
Translate a broad claim such as “continuous monitoring” into concrete questions: what is sampled, how often, which events are selected, and how records travel from the kernel to durable storage or a remote service. A polling snapshot can establish state at read time; an audit record or eBPF event can establish only what its configured collection path captured and delivered.
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For a specific agent, verify the deployed version and host configuration rather than assuming that a capability supported by Linux is enabled in the product. Look for evidence of installed rules, attached programs, required permissions, supported kernels, and reporting for drops or forwarding failures.
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