An
SLI (service level indicator) measures compliance with an SLO (service level objective)
. So, for example, if your SLA specifies that your systems will be available 99.95% of the time, your SLO is likely 99.95% uptime and your SLI is the actual measurement of your uptime.
What is SRE SLI?
Service Level Indicators
(SLIs)
SLI as defined in Google’s SRE Handbook is, “a carefully defined quantitative measure of some aspect of the level of service that is provided.” SLIs are measurements of the characteristics of a service.
What is GCP SLI SLO?
An SLO is
a target value for an SLI, measured over a period of time
. The service determines the available SLIs, and you specify SLOs based on the SLIs. The SLO defines what qualifies as good service. … A time period, called the compliance period, for measuring how the SLI compares to the performance goal.
Why do we need SLO?
SLOs
Set Expectations
Users (and potential users) often want to know what they can expect from a service in order to understand whether it’s appropriate for their use case. … If your service’s actual performance is much better than its stated SLO, users will come to rely on its current performance.
What are examples of SLI?
- Latency.
- Availability.
- Error rate.
- Throughput.
- Response time.
- Durability.
What does SLI stand for?
SLI stands for
Scalable Link Interface
.
How is SLI calculated?
While many numbers can function as an SLI, we generally recommend treating the SLI as the
ratio of two numbers: the number of good events divided by the total number of events
. For example: Number of successful HTTP requests / total HTTP requests (success rate)
What are SRE principles?
Site reliability engineering (SRE) is a
set of principles and practices that incorporates aspects of software engineering
and applies them to infrastructure and operations problems. The main goals are to create scalable and highly reliable software systems.
What is SRE observability?
Observability is
instrumenting your systems with tools to collect actionable data to know when the errors occur
—but more importantly, why they happen. … SREs can use observability to: Provide high-quality applications and software at scale. View real-time performance for their digital assets.
What is SRE vs DevOps?
In a nutshell,
DevOps Engineers are ops-focused engineers who solve development pipeline problems
. Site Reliability Engineers are development-focused engineers who solve operational/scale/reliability problems.
Who defines SLO?
service level objective (SLO):
the level that you expect a service to achieve most of the time and against which an
SLI is measured. Example: “Service responses shall be faster than 400 milliseconds (ms) for 95% of all valid requests measured over 14 days.”
What are KPIs and SLAs?
The difference between SLAs and KPIs
An SLA is
an agreement between you and your customer that defines how your relationship will work in the future
. Key performance indicators (KPIs) are the metrics chosen to gauge how well a team performed against agreed standards.
How do you calculate SLI in Sre?
The SLI equation is
the number of good events divided by the total number of valid events, multiplied by 100
to keep it a uniform percentage. Let’s look at the SLIs we want to measure for the “Checkout” critical user journey.
What is SLO vs SLA?
SLA
or Service Level Agreement
is a contract that the service provider promises customers on service availability, performance, etc. SLO or Service Level Objective is a goal that service provider wants to reach.
What makes a good SLO?
The typical industry standard is to set SLO
targets as a number of nines
(e.g., 99.9 percent is known as “three nines”, 99.95 percent is known as “three and a half nines”). And as a general rule of thumb, you should keep your SLOs slightly stricter than what you detail in your SLAs.
What does SLO mean for teachers?
What Are SLOs?
A Student Learning Objective
is the implementation of a long-term academic goal or set of goals created by a teacher or group of teachers using data about students and their learning over a defined period of time. SLOs are being used as a component of teacher evaluation in many states, including Maine.
