[OWL-308] add API /api/alive
[OWL-308] add API /api/alive

masato25/open-falcon-backend,Cepave/query,Cepave/open-falcon-backend,Cepave/query,Cepave/open-falcon-backend,masato25/query,masato25/query,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/query,masato25/query,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/query,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/query