Add /health endpoint that returns last_process timestamp, fix issue #6009

tests/rpc/test_rpc.py

@@ -1272,3 +1272,12 @@ def test_rpc_edge_enabled(mocker, edge_conf) -> None:
     assert ret[0]['Winrate'] == 0.66
     assert ret[0]['Expectancy'] == 1.71
     assert ret[0]['Stoploss'] == -0.02
+
+
+def test_rpc_health(mocker, default_conf) -> None:
+    mocker.patch('freqtrade.rpc.telegram.Telegram', MagicMock())
+
+    freqtradebot = get_patched_freqtradebot(mocker, default_conf)
+    rpc = RPC(freqtradebot)
+    ret = rpc._health()
+    assert ret['last_process'] == '1970-01-01 00:00:00'

tests/rpc/test_rpc_apiserver.py

@@ -1442,3 +1442,13 @@ def test_api_backtesting(botclient, mocker, fee, caplog, tmpdir):
     assert result['status'] == 'reset'
     assert not result['running']
     assert result['status_msg'] == 'Backtest reset'
+
+
+def test_health(botclient):
+    ftbot, client = botclient
+
+    rc = client_get(client, f"{BASE_URI}/health")
+
+    assert_response(rc)
+    ret = rc.json()
+    assert ret['last_process'] == '1970-01-01T00:00:00'