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Planning & Processabbreviation · /ɛm tiː tiː diː/

MTTD

In simple English

In tech companies, MTTD is a critical performance metric used to measure how quickly your monitoring, logging, and alerting systems can identify problems. A lower MTTD is better because it means your team catches issues faster, before they impact users or cause larger damage. MTTD is often discussed alongside other metrics like MTTR (Mean Time To Repair) and MTTF (Mean Time To Failure). In incident response meetings and post-mortems, teams analyze their MTTD to understand where they can improve their observability and monitoring infrastructure. DevOps and Site Reliability Engineering (SRE) teams typically own and optimize MTTD as part of their operational excellence strategy.

Definition and importance of MTTD metric in software engineering and incident response

At a glanceCEFR C1
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We should focus on improving our MTTD this quarter
✓Our MTTD is currently around 15 minutes for critical alerts
✓Lower MTTD means faster incident detection

Real examples

in a standup

"Our MTTD for database errors has improved from 30 minutes to 10 minutes thanks to the new monitoring dashboard."

in a post-mortem

"The incident could have been contained much faster if our MTTD had been better; we did not notice the spike for over an hour."

in a team meeting

"As part of our SLO improvements, we are targeting an MTTD of under 5 minutes for all P1 issues."

Don't say this

Handle with care. MTTD is sometimes confused with MTTR (Mean Time To Repair). MTTD measures detection speed, while MTTR measures repair speed. Do not use them interchangeably.

✕We need to improve our MTTD by fixing bugs faster.
✓We need to improve our MTTD by improving our monitoring and alerting systems.— MTTD is about detection speed, not repair speed. Confusing it with MTTR is a common mistake.
✕Our MTTD was high, so we shipped the feature on time.
✓Our MTTD was high, so we missed critical bugs in production.— High MTTD is bad (slow detection). Use context that shows negative consequences.
✕We calculated the MTTD by looking at how long repairs took.
✓We calculated the MTTD by measuring the time from issue occurrence to first alert.— MTTD measures detection time, not repair time.

Other forms

abbreviation

MTTD

"Our current MTTD is approximately 20 minutes."

noun

Mean Time To Detect

"Mean Time To Detect is a key SRE metric."

Often used with

reduce MTTDTo make detection faster; most common action verb
improve MTTDTo enhance detection capabilities and speed
MTTD targetA goal or SLO for how fast detection should be
MTTD metricUsing MTTD as a measurable indicator
low MTTDFast detection; desirable condition

Similar words

detection timeMore descriptive but less formal than the acronym
time to discoveryBroader term covering awareness of any issue

Opposites

high MTTDslow detection

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your monitoring team wants to discuss detection speed. Which sentence is most natural?

Complete the sentence

2. Our incident response SLO requires an _______ of no more than 10 minutes for critical issues.

Spot the mistake

3. Which sentence uses MTTD incorrectly?

Rewrite naturally

4. Rewrite this using MTTD: The time it takes us to notice when something breaks in production is currently too long, and we need to make it faster using better monitoring tools.

Questions

Quick poll

Have you said "mttd" in a standup this week?

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