Review a logging or monitoring vendor by asking what data it will receive, who can read it, where and how long it is kept, how it is protected, how you can delete it and what happens when you leave. Start with what you send, because you control that. This is not legal advice, and counsel decides contract terms.
Why these vendors need extra care
Application logs, traces and error events pass through many systems. A monitoring vendor often becomes the single biggest copy of operational data, searchable by many staff. OWASP's Logging Cheat Sheet says to perform due diligence checks before sending event data to third parties, and to protect logs in transit and at rest, including restricted read access and monitoring of access to logs.
Ten questions
| # | Question | Look for |
|---|---|---|
| 1 | What data fields will we send? | Our allowlist, in writing |
| 2 | Can we filter or mask before sending? | Agent or SDK side scrubbing |
| 3 | Who at the vendor can read our data? | Role based, logged access |
| 4 | Where is data stored? | Named regions |
| 5 | How is it encrypted in transit and at rest? | Specific mechanisms |
| 6 | Can we set retention per dataset? | Short, configurable |
| 7 | Can we delete on request and on exit? | Documented process |
| 8 | Do they use subprocessors? | A current list |
| 9 | How do they notify us of an incident? | Timeline in the contract |
| 10 | What independent assurance exists? | Reports you can read yourself |
On question 10, read the report scope. Do not accept the existence of a report as an answer. Check what systems and period it covers.
Do it in this order
- Decide what you will send. Write the field list.
- Test the integration in staging with fake sensitive values and check what arrives.
- Send the questions above and note unanswered ones.
- Ask counsel whether an agreement beyond standard terms is needed for your situation.
- Configure retention, access and single sign on before sending real data.
- Record the decision, date and owner.
- Reassess annually and after major changes.
Red flags
- The vendor cannot say who can read your data.
- Scrubbing is only possible after data arrives.
- Deletion is possible only by contacting support with no timeline.
- Answers differ between sales and the written documents.
Where Safeguard fits
Safeguard covers software supply chain and application security, including dependency scanning and compliance and evidence automation. It does not replace a vendor questionnaire, but it can hold the review record and evidence in one place. A free scan is available at gold.safeguard.sh/scan.
Quick check
Is a monitoring vendor in scope if we never log patient data?
Verify that claim by testing. If the field list is truly clean, the review can be lighter, but keep the record.
Should we self host instead?
Self hosting moves the risk to your operations. Weigh patching, access control and backups before deciding.
Sources
Last reviewed: 19 October 2026.
