The Cloud computing paradigm has revolutionised the computer science horizon during the past decade and
has enabled the emergence of computing as the fifth utility. It has captured significant attention of academia,
industries, and government bodies. Now, it has emerged as the backbone of modern economy by offering
subscription-based services anytime, anywhere following a pay-as-you-go model. This has instigated (1) shorter
establishment times for start-ups, (2) creation of scalable global enterprise applications, (3) better cost-to-value
associativity for scientific and high performance computing applications, and (4) different invocation/execution
models for pervasive and ubiquitous applications. The recent technological developments and paradigms such
as serverless computing, software-defined networking, Internet of Things, and processing at network edge
are creating new opportunities for Cloud computing. However, they are also posing several new challenges
and creating the need for new approaches and research strategies, as well as the re-evaluation of the models
that were developed to address issues such as scalability, elasticity, reliability, security, sustainability, and
application models. The proposed manifesto addresses them by identifying the major open challenges in
Cloud computing, emerging trends, and impact areas. It then offers research directions for the next decade,
thus helping in the realisation of Future Generation Cloud Computing.