If thats the expectation of your users, then you have to serve that. People expect that when they do things on a phone, it's immediately available across the world for someone else to see. Ultimately, it comes back to availability. What is the most important metric that teams should have an SLO for? How do you measure that metric? The SLO graph sparked a great conversation that led to him saying, “Lets double down on some of these architecture investment effort that we've been talking about!” He jumped right in and asked “So what are we doing about it?” He was asking all the relevant questions without needing any context. Its been very useful for the leadership to gain visibility on our SLO performance.Recently, our new SVP of Engineering came to the service review meeting where I was presenting our performance against our SLOs. How has measuring against SLOs affected your leadership team? Without SLO tracking, we wouldn't have the data to justify the time investment in the architecture. When a piece of architecture is prone to failure and causing us to not meet our SLO, we can make a conscious decision to invest time (or not) to make it better.
One bar graph I use shows our performance for availability on top of our SLO for each month over the most recent 6 months.The SLO graph helps us drive product roadmap decisions. How have SLOs changed the way your company operates?Įvery month, I present how well we have been meeting our SLOs.
This way you know you are running as fast as you can without compromising availability. Continuing the example, a 0.05% monthly error budget for availability (based on a 99.95% uptime target) means your service can be unavailable for around 22 minutes in that month.Error budget = 43800 min/month x 0.05% = ~22 min/monthSRE practices encourage you to strategically burn the budget to zero every month, whether its for feature launches or architectural changes. Are we not? Now we need to put back pressure from the operations side - how do we fix the reason why we are not meeting our SLO.Īn error budget is 1 minus the SLO. Are we meeting the SLO? If so, product engineering can run faster. Thats why you want to set your SLOs to be more stringent than your SLAs.īoth your DevOps and product development teams are responsible for meeting the SLO. When you don't meet your SLA, you compensate customers with dollars. SLA, Service Level Agreement, is an external metric that you are legally obligated to meet, such as 99% for availability. SLI, Service Level Indicator, is the name for the metric.For example, if an SLI you are measuring is availability, then a corresponding SLO you might set would be 99.95%.Setting an appropriate SLO is an art in and of itself, but ultimately you should endeavor to set a target that is above the point at which your users feel pain and also one that you can realistically meet (i.e. SLO, Service Level Objective, is an internal target for a metric that you are measuring. SLOs, SLIs, and SLAs are used exclusively for metrics that capture your users experience, such as availability, request latency, throughput, and error rate, etc. Having SLOs in place for your production services allow you to remove the emotion and ambiguity when it comes to figuring out the impact of an unplanned outage or a bug released to production.īlameless: What is an SLO? How does it relate to SLI and SLA?
#What is evernote resource that is unavailable 2016 code
To that end, SLOs are a critical part of shipping code to your production environment. We should invest in our architecture.” They say, “Wheres the data?” You go, “Heres my SLO graph.” Their product is a cross-platform SaaS application designed to enable people to organize, personalize, consume, and share thoughts from any device at any time.Īnytime you go to the leaders with “Heres my problem. running the production infrastructure, for Evernotes over 220M users across 5 billion resources. Garrett's SRE team of 15-20 engineers is responsible for keeping the lights on, a.k.a. When should you deal with your technical debt? How can you bring the leadership team on board? What does the SLO have to do with these questions?īlameless chatted with SRE leader Garrett Plasky to get the answers. If fixing tech debt is not handled or timed well, the company's product and business health will both suffer. Architecture changes, code refactor, and slowing down feature development for product availability are mostly wishful thinking, even though these efforts inevitably become mission-critical for every company. Traditionally, DevOps engineers have had their hands tied when they ask for investments in reducing technical debt.
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