They call them agents instead of jobs. You will be able to use 10 concurrent agents at any one time. As long as you have an agent free you will be able to build or test a job.
If you try to run 11 jobs at once, 1-10 will start and 11 will wait until an agent is ready.
As stated in Balazs's comment, they have an answer in their starter licensing page at the bottom. Bamboo's hierarchy is Project->Plan->Stage->Job->Task. So I have one branch in one repository I automatically build from Bitbucket Server locally. That's one project containing one plan containing 1 stage with 1 Job that has 5 tasks (checkout, build, custom script, run tests, parse test results). So I could automatically build and test 10 separate branches in the same or different repositories with this simple setup.
With a Bamboo Starter License, you are restricted to 10 build Jobs, and 0 remote agents, but can run unlimited local agents. A Job is a single build unit within a Plan. One or more Jobs can be organised into one or more Stages. Given a 10 Job limit, you may distribute your Jobs between up to 10 Plans - for example, one Job per Plan or all 10 Jobs within one Plan. There is no limit on the number of times a Plan is built/executed.
Please note that use of the Plan Branches has a multiplicative effect on the number of jobs configured, and therefore an effect on the 10 jobs cap. For example, a plan with two jobs that is building against a total of three branches (the plan's original branch, plus two additional branches) will contribute 6 jobs toward the limit.
The job multiplier on branches is an unfairly onerous restriction, especially for Bitbucket git repositories using a release branch management style as apparently the master branch is automatically included along with other configured branches.
For example, we added develop and a feature branch to our plan with two jobs. That is counting as 6 jobs (including master branch) toward the starter license limit! Unless there are some settings or hidden jobs I am missing.
Yeah, that's one thing that drove me to TeamCity. They should eliminate branches taking up jobs as you can't get very much done with that. You'd end up with a couple plans with branches at most which isn't very helpful. TeamCity doesn't use branches as part of it and you get 100 build configurations for free with 3 build agents. Bamboo can't nearly match that right now. It's too bad because I like the design of Bamboo better. Jenkins Blue Ocean is probably the next best bet.
Actually the opposite is stated here: https://www.atlassian.com/licensing/starter#bamboo-1
With a Bamboo Starter License, you are restricted to 1 local agent and 10 Jobs. .... Given a 10 Job limit, you may distribute your Jobs between up to 10 Plans - for example, one Job per Plan or all 10 Jobs within one Plan.
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